Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050

V. Batista, S. Dong, A. Gould, J. P. Beaulieu, A. Cassan, G. W. Christie, C. Han, A. Udalski, W. Allen, D. L. DePoy, A. Gal-Yam, B. S. Gaudi, B. Johnson, S. Kaspi, C. U. Lee, D. Maoz, J. McCormick, I. McGreer, B. Monard, T. Natusch & 76 others E. Ofek, B. G. Park, R. W. Pogge, D. Polishook, A. Shporer, M. D. Albrow, D. P. Bennett, S. Brillant, M. Bode, D. M. Bramich, M. Burgdorf, J. A R Caldwell, H. Calitz, A. Cole, K. H. Cook, Ch Coutures, S. Dieters, M. Dominik, D. D. Prester, J. Donatowicz, P. Fouqué, J. Greenhill, M. Hoffman, K. Horne, U. G. Jørgensen, N. Kains, S. Kane, D. Kubas, J. B. Marquette, R. Martin, P. Meintjes, J. Menzies, K. R. Pollard, K. C. Sahu, C. Snodgrass, I. Steele, Y. Tsapras, J. Wambsganss, A. Williams, M. Zub, P. Wyrzykowski, M. Kubiak, M. K. Szymánski, G. Pietrzýnski, I. Soszýnski, O. Szewczyk, K. Ulaczyk, F. Abe, I. A. Bond, A. Fukui, K. Furusawa, J. B. Hearnshaw, S. Holderness, Y. Itow, K. Kamiya, P. M. Kilmartin, A. Korpela, W. Lin, C. H. Ling, K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, M. Nagaya, K. Ohnishi, T. Okumura, Y. C. Perrott, N. Rattenbury, T. Saito, T. Sako, L. Skuljan, D. Sullivan, T. Sumi, W. L. Sweatman, P. J. Tristram, P. C M Yock

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Aims. We analyze OGLE-2007-BLG-050, a high magnification microlensing event (Ã432) whose peak occurred on 2 May, 2007, with pronounced finite-source and parallax effects. We compute planet detection efficiencies for this event in order to determine its sensitivity to the presence of planets around the lens star.Methods. Both finite-source and parallax effects permit a measurement of the angular Einstein radius E=0.48±0.01 mas and the parallax πE=0.12±0.03, leading to an estimate of the lens mass M=0.50±0.14 M and its distance to the observer DL=5.5±0.4 kpc. This is only the second determination of a reasonably precise (<30%) mass estimate for an isolated unseen object, using any method. This allows us to calculate the planetary detection efficiency in physical units (r,m), where r is the projected planet-star separation and mp is the planet mass.Results. When computing planet detection efficiency, we did not find any planetary signature, i.e. none of the planetary configurations provides a δX 2 improvement higher than 60, and our detection efficiency results reveal significant sensitivity to Neptune-mass planets, and to a lesser extent Earth-mass planets in some configurations. Indeed, Jupiter and Neptune-mass planets are excluded with a high confidence for a large projected separation range between the planet and the lens star, respectively [0.6-10] and [1.4-4] AU, and Earth-mass planets are excluded with a 10% confidence in the lensing zone, i.e. [1.8-3.1] AU.

Original languageEnglish
Pages (from-to)467-478
Number of pages12
JournalAstronomy and Astrophysics
Volume508
Issue number1
DOIs
Publication statusPublished - 2 Dec 2009
Externally publishedYes

Fingerprint

planets
planet
stars
parallax
planet detection
Neptune (planet)
lenses
Neptune
confidence
detection
sensitivity
estimates
configurations
magnification
Jupiter (planet)
Jupiter
signatures
radii

Keywords

  • Gravitational lensing
  • Planetary systems
  • Stars: individual: OGLE 2007-BLG-050
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Batista, V., Dong, S., Gould, A., Beaulieu, J. P., Cassan, A., Christie, G. W., ... Yock, P. C. M. (2009). Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050. Astronomy and Astrophysics, 508(1), 467-478. https://doi.org/10.1051/0004-6361/200912923

Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050. / Batista, V.; Dong, S.; Gould, A.; Beaulieu, J. P.; Cassan, A.; Christie, G. W.; Han, C.; Udalski, A.; Allen, W.; DePoy, D. L.; Gal-Yam, A.; Gaudi, B. S.; Johnson, B.; Kaspi, S.; Lee, C. U.; Maoz, D.; McCormick, J.; McGreer, I.; Monard, B.; Natusch, T.; Ofek, E.; Park, B. G.; Pogge, R. W.; Polishook, D.; Shporer, A.; Albrow, M. D.; Bennett, D. P.; Brillant, S.; Bode, M.; Bramich, D. M.; Burgdorf, M.; Caldwell, J. A R; Calitz, H.; Cole, A.; Cook, K. H.; Coutures, Ch; Dieters, S.; Dominik, M.; Prester, D. D.; Donatowicz, J.; Fouqué, P.; Greenhill, J.; Hoffman, M.; Horne, K.; Jørgensen, U. G.; Kains, N.; Kane, S.; Kubas, D.; Marquette, J. B.; Martin, R.; Meintjes, P.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Snodgrass, C.; Steele, I.; Tsapras, Y.; Wambsganss, J.; Williams, A.; Zub, M.; Wyrzykowski, P.; Kubiak, M.; Szymánski, M. K.; Pietrzýnski, G.; Soszýnski, I.; Szewczyk, O.; Ulaczyk, K.; Abe, F.; Bond, I. A.; Fukui, A.; Furusawa, K.; Hearnshaw, J. B.; Holderness, S.; Itow, Y.; Kamiya, K.; Kilmartin, P. M.; Korpela, A.; Lin, W.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Miyake, N.; Muraki, Y.; Nagaya, M.; Ohnishi, K.; Okumura, T.; Perrott, Y. C.; Rattenbury, N.; Saito, T.; Sako, T.; Skuljan, L.; Sullivan, D.; Sumi, T.; Sweatman, W. L.; Tristram, P. J.; Yock, P. C M.

In: Astronomy and Astrophysics, Vol. 508, No. 1, 02.12.2009, p. 467-478.

Research output: Contribution to journalArticle

Batista, V, Dong, S, Gould, A, Beaulieu, JP, Cassan, A, Christie, GW, Han, C, Udalski, A, Allen, W, DePoy, DL, Gal-Yam, A, Gaudi, BS, Johnson, B, Kaspi, S, Lee, CU, Maoz, D, McCormick, J, McGreer, I, Monard, B, Natusch, T, Ofek, E, Park, BG, Pogge, RW, Polishook, D, Shporer, A, Albrow, MD, Bennett, DP, Brillant, S, Bode, M, Bramich, DM, Burgdorf, M, Caldwell, JAR, Calitz, H, Cole, A, Cook, KH, Coutures, C, Dieters, S, Dominik, M, Prester, DD, Donatowicz, J, Fouqué, P, Greenhill, J, Hoffman, M, Horne, K, Jørgensen, UG, Kains, N, Kane, S, Kubas, D, Marquette, JB, Martin, R, Meintjes, P, Menzies, J, Pollard, KR, Sahu, KC, Snodgrass, C, Steele, I, Tsapras, Y, Wambsganss, J, Williams, A, Zub, M, Wyrzykowski, P, Kubiak, M, Szymánski, MK, Pietrzýnski, G, Soszýnski, I, Szewczyk, O, Ulaczyk, K, Abe, F, Bond, IA, Fukui, A, Furusawa, K, Hearnshaw, JB, Holderness, S, Itow, Y, Kamiya, K, Kilmartin, PM, Korpela, A, Lin, W, Ling, CH, Masuda, K, Matsubara, Y, Miyake, N, Muraki, Y, Nagaya, M, Ohnishi, K, Okumura, T, Perrott, YC, Rattenbury, N, Saito, T, Sako, T, Skuljan, L, Sullivan, D, Sumi, T, Sweatman, WL, Tristram, PJ & Yock, PCM 2009, 'Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050', Astronomy and Astrophysics, vol. 508, no. 1, pp. 467-478. https://doi.org/10.1051/0004-6361/200912923
Batista, V. ; Dong, S. ; Gould, A. ; Beaulieu, J. P. ; Cassan, A. ; Christie, G. W. ; Han, C. ; Udalski, A. ; Allen, W. ; DePoy, D. L. ; Gal-Yam, A. ; Gaudi, B. S. ; Johnson, B. ; Kaspi, S. ; Lee, C. U. ; Maoz, D. ; McCormick, J. ; McGreer, I. ; Monard, B. ; Natusch, T. ; Ofek, E. ; Park, B. G. ; Pogge, R. W. ; Polishook, D. ; Shporer, A. ; Albrow, M. D. ; Bennett, D. P. ; Brillant, S. ; Bode, M. ; Bramich, D. M. ; Burgdorf, M. ; Caldwell, J. A R ; Calitz, H. ; Cole, A. ; Cook, K. H. ; Coutures, Ch ; Dieters, S. ; Dominik, M. ; Prester, D. D. ; Donatowicz, J. ; Fouqué, P. ; Greenhill, J. ; Hoffman, M. ; Horne, K. ; Jørgensen, U. G. ; Kains, N. ; Kane, S. ; Kubas, D. ; Marquette, J. B. ; Martin, R. ; Meintjes, P. ; Menzies, J. ; Pollard, K. R. ; Sahu, K. C. ; Snodgrass, C. ; Steele, I. ; Tsapras, Y. ; Wambsganss, J. ; Williams, A. ; Zub, M. ; Wyrzykowski, P. ; Kubiak, M. ; Szymánski, M. K. ; Pietrzýnski, G. ; Soszýnski, I. ; Szewczyk, O. ; Ulaczyk, K. ; Abe, F. ; Bond, I. A. ; Fukui, A. ; Furusawa, K. ; Hearnshaw, J. B. ; Holderness, S. ; Itow, Y. ; Kamiya, K. ; Kilmartin, P. M. ; Korpela, A. ; Lin, W. ; Ling, C. H. ; Masuda, K. ; Matsubara, Y. ; Miyake, N. ; Muraki, Y. ; Nagaya, M. ; Ohnishi, K. ; Okumura, T. ; Perrott, Y. C. ; Rattenbury, N. ; Saito, T. ; Sako, T. ; Skuljan, L. ; Sullivan, D. ; Sumi, T. ; Sweatman, W. L. ; Tristram, P. J. ; Yock, P. C M. / Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050. In: Astronomy and Astrophysics. 2009 ; Vol. 508, No. 1. pp. 467-478.
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title = "Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050",
abstract = "Aims. We analyze OGLE-2007-BLG-050, a high magnification microlensing event ({\~A}432) whose peak occurred on 2 May, 2007, with pronounced finite-source and parallax effects. We compute planet detection efficiencies for this event in order to determine its sensitivity to the presence of planets around the lens star.Methods. Both finite-source and parallax effects permit a measurement of the angular Einstein radius E=0.48±0.01 mas and the parallax πE=0.12±0.03, leading to an estimate of the lens mass M=0.50±0.14 M and its distance to the observer DL=5.5±0.4 kpc. This is only the second determination of a reasonably precise (<30{\%}) mass estimate for an isolated unseen object, using any method. This allows us to calculate the planetary detection efficiency in physical units (r,m), where r is the projected planet-star separation and mp is the planet mass.Results. When computing planet detection efficiency, we did not find any planetary signature, i.e. none of the planetary configurations provides a δX 2 improvement higher than 60, and our detection efficiency results reveal significant sensitivity to Neptune-mass planets, and to a lesser extent Earth-mass planets in some configurations. Indeed, Jupiter and Neptune-mass planets are excluded with a high confidence for a large projected separation range between the planet and the lens star, respectively [0.6-10] and [1.4-4] AU, and Earth-mass planets are excluded with a 10{\%} confidence in the lensing zone, i.e. [1.8-3.1] AU.",
keywords = "Gravitational lensing, Planetary systems, Stars: individual: OGLE 2007-BLG-050, Techniques: photometric",
author = "V. Batista and S. Dong and A. Gould and Beaulieu, {J. P.} and A. Cassan and Christie, {G. W.} and C. Han and A. Udalski and W. Allen and DePoy, {D. L.} and A. Gal-Yam and Gaudi, {B. S.} and B. Johnson and S. Kaspi and Lee, {C. U.} and D. Maoz and J. McCormick and I. McGreer and B. Monard and T. Natusch and E. Ofek and Park, {B. G.} and Pogge, {R. W.} and D. Polishook and A. Shporer and Albrow, {M. D.} and Bennett, {D. P.} and S. Brillant and M. Bode and Bramich, {D. M.} and M. Burgdorf and Caldwell, {J. A R} and H. Calitz and A. Cole and Cook, {K. H.} and Ch Coutures and S. Dieters and M. Dominik and Prester, {D. D.} and J. Donatowicz and P. Fouqu{\'e} and J. Greenhill and M. Hoffman and K. Horne and J{\o}rgensen, {U. G.} and N. Kains and S. Kane and D. Kubas and Marquette, {J. B.} and R. Martin and P. Meintjes and J. Menzies and Pollard, {K. R.} and Sahu, {K. C.} and C. Snodgrass and I. Steele and Y. Tsapras and J. Wambsganss and A. Williams and M. Zub and P. Wyrzykowski and M. Kubiak and Szym{\'a}nski, {M. K.} and G. Pietrz{\'y}nski and I. Sosz{\'y}nski and O. Szewczyk and K. Ulaczyk and F. Abe and Bond, {I. A.} and A. Fukui and K. Furusawa and Hearnshaw, {J. B.} and S. Holderness and Y. Itow and K. Kamiya and Kilmartin, {P. M.} and A. Korpela and W. Lin and Ling, {C. H.} and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and M. Nagaya and K. Ohnishi and T. Okumura and Perrott, {Y. C.} and N. Rattenbury and T. Saito and T. Sako and L. Skuljan and D. Sullivan and T. Sumi and Sweatman, {W. L.} and Tristram, {P. J.} and Yock, {P. C M}",
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month = "12",
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doi = "10.1051/0004-6361/200912923",
language = "English",
volume = "508",
pages = "467--478",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
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TY - JOUR

T1 - Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050

AU - Batista, V.

AU - Dong, S.

AU - Gould, A.

AU - Beaulieu, J. P.

AU - Cassan, A.

AU - Christie, G. W.

AU - Han, C.

AU - Udalski, A.

AU - Allen, W.

AU - DePoy, D. L.

AU - Gal-Yam, A.

AU - Gaudi, B. S.

AU - Johnson, B.

AU - Kaspi, S.

AU - Lee, C. U.

AU - Maoz, D.

AU - McCormick, J.

AU - McGreer, I.

AU - Monard, B.

AU - Natusch, T.

AU - Ofek, E.

AU - Park, B. G.

AU - Pogge, R. W.

AU - Polishook, D.

AU - Shporer, A.

AU - Albrow, M. D.

AU - Bennett, D. P.

AU - Brillant, S.

AU - Bode, M.

AU - Bramich, D. M.

AU - Burgdorf, M.

AU - Caldwell, J. A R

AU - Calitz, H.

AU - Cole, A.

AU - Cook, K. H.

AU - Coutures, Ch

AU - Dieters, S.

AU - Dominik, M.

AU - Prester, D. D.

AU - Donatowicz, J.

AU - Fouqué, P.

AU - Greenhill, J.

AU - Hoffman, M.

AU - Horne, K.

AU - Jørgensen, U. G.

AU - Kains, N.

AU - Kane, S.

AU - Kubas, D.

AU - Marquette, J. B.

AU - Martin, R.

AU - Meintjes, P.

AU - Menzies, J.

AU - Pollard, K. R.

AU - Sahu, K. C.

AU - Snodgrass, C.

AU - Steele, I.

AU - Tsapras, Y.

AU - Wambsganss, J.

AU - Williams, A.

AU - Zub, M.

AU - Wyrzykowski, P.

AU - Kubiak, M.

AU - Szymánski, M. K.

AU - Pietrzýnski, G.

AU - Soszýnski, I.

AU - Szewczyk, O.

AU - Ulaczyk, K.

AU - Abe, F.

AU - Bond, I. A.

AU - Fukui, A.

AU - Furusawa, K.

AU - Hearnshaw, J. B.

AU - Holderness, S.

AU - Itow, Y.

AU - Kamiya, K.

AU - Kilmartin, P. M.

AU - Korpela, A.

AU - Lin, W.

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Miyake, N.

AU - Muraki, Y.

AU - Nagaya, M.

AU - Ohnishi, K.

AU - Okumura, T.

AU - Perrott, Y. C.

AU - Rattenbury, N.

AU - Saito, T.

AU - Sako, T.

AU - Skuljan, L.

AU - Sullivan, D.

AU - Sumi, T.

AU - Sweatman, W. L.

AU - Tristram, P. J.

AU - Yock, P. C M

PY - 2009/12/2

Y1 - 2009/12/2

N2 - Aims. We analyze OGLE-2007-BLG-050, a high magnification microlensing event (Ã432) whose peak occurred on 2 May, 2007, with pronounced finite-source and parallax effects. We compute planet detection efficiencies for this event in order to determine its sensitivity to the presence of planets around the lens star.Methods. Both finite-source and parallax effects permit a measurement of the angular Einstein radius E=0.48±0.01 mas and the parallax πE=0.12±0.03, leading to an estimate of the lens mass M=0.50±0.14 M and its distance to the observer DL=5.5±0.4 kpc. This is only the second determination of a reasonably precise (<30%) mass estimate for an isolated unseen object, using any method. This allows us to calculate the planetary detection efficiency in physical units (r,m), where r is the projected planet-star separation and mp is the planet mass.Results. When computing planet detection efficiency, we did not find any planetary signature, i.e. none of the planetary configurations provides a δX 2 improvement higher than 60, and our detection efficiency results reveal significant sensitivity to Neptune-mass planets, and to a lesser extent Earth-mass planets in some configurations. Indeed, Jupiter and Neptune-mass planets are excluded with a high confidence for a large projected separation range between the planet and the lens star, respectively [0.6-10] and [1.4-4] AU, and Earth-mass planets are excluded with a 10% confidence in the lensing zone, i.e. [1.8-3.1] AU.

AB - Aims. We analyze OGLE-2007-BLG-050, a high magnification microlensing event (Ã432) whose peak occurred on 2 May, 2007, with pronounced finite-source and parallax effects. We compute planet detection efficiencies for this event in order to determine its sensitivity to the presence of planets around the lens star.Methods. Both finite-source and parallax effects permit a measurement of the angular Einstein radius E=0.48±0.01 mas and the parallax πE=0.12±0.03, leading to an estimate of the lens mass M=0.50±0.14 M and its distance to the observer DL=5.5±0.4 kpc. This is only the second determination of a reasonably precise (<30%) mass estimate for an isolated unseen object, using any method. This allows us to calculate the planetary detection efficiency in physical units (r,m), where r is the projected planet-star separation and mp is the planet mass.Results. When computing planet detection efficiency, we did not find any planetary signature, i.e. none of the planetary configurations provides a δX 2 improvement higher than 60, and our detection efficiency results reveal significant sensitivity to Neptune-mass planets, and to a lesser extent Earth-mass planets in some configurations. Indeed, Jupiter and Neptune-mass planets are excluded with a high confidence for a large projected separation range between the planet and the lens star, respectively [0.6-10] and [1.4-4] AU, and Earth-mass planets are excluded with a 10% confidence in the lensing zone, i.e. [1.8-3.1] AU.

KW - Gravitational lensing

KW - Planetary systems

KW - Stars: individual: OGLE 2007-BLG-050

KW - Techniques: photometric

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UR - http://www.scopus.com/inward/citedby.url?scp=71849106891&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/200912923

DO - 10.1051/0004-6361/200912923

M3 - Article

VL - 508

SP - 467

EP - 478

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 1

ER -