The first circumbinary planet found by microlensing

OGLE-2007-BLG-349L(AB)c

D. P. Bennett, S. H. Rhie, A. Udalski, A. Gould, Y. Tsapras, D. Kubas, I. A. Bond, J. Greenhill, A. Cassan, N. J. Rattenbury, T. S. Boyajian, J. Luhn, M. T. Penny, J. Anderson, F. Abe, A. Bhattacharya, C. S. Botzler, M. Donachie, M. Freeman, A. Fukui & 62 others Y. Hirao, Y. Itow, N. Koshimoto, M. C A Li, C. H. Ling, K. Masuda, Y. Matsubara, Y. Muraki, M. Nagakane, K. Ohnishi, H. Oyokawa, Y. C. Perrott, To Saito, A. Sharan, D. J. Sullivan, T. Sumi, D. Suzuki, P. J. Tristram, A. Yonehara, P. C M Yock, M. K. Szymański, I. Soszyński, K. Ulaczyk, Wyrzykowski, W. Allen, D. DePoy, A. Gal-Yam, B. S. Gaudi, C. Han, I. A G Monard, E. Ofek, R. W. Pogge, R. A. Street, D. M. Bramich, M. Dominik, K. Horne, C. Snodgrass, I. A. Steele, M. D. Albrow, E. Bachelet, V. Batista, J. P. Beaulieu, S. Brillant, J. A R Caldwell, A. Cole, C. Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, P. Fouqué, M. Hundertmark, U. G. Jørgensen, N. Kains, S. R. Kane, J. B. Marquette, J. Menzies, K. R. Pollard, C. Ranc, K. C. Sahu, J. Wambsganss, A. Williams, M. Zub

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We present the analysis of the first circumbinary planet microlensing event, OGLE-2007-BLG-349. This event has a strong planetary signal that is best fit with a mass ratio of q ≈ 3.4 × 10-4, but there is an additional signal due to an additional lens mass, either another planet or another star. We find acceptable light-curve fits with two classes of models: two-planet models (with a single host star) and circumbinary planet models. The light curve also reveals a significant microlensing parallax effect, which constrains the mass of the lens system to be M L ≈ 0.7 M. Hubble Space Telescope (HST) images resolve the lens and source stars from their neighbors and indicate excess flux due to the star(s) in the lens system. This is consistent with the predicted flux from the circumbinary models, where the lens mass is shared between two stars, but there is not enough flux to be consistent with the two-planet, one-star models. So, only the circumbinary models are consistent with the HST data. They indicate a planet of mass m c = 80 ± 13 M, orbiting a pair of M dwarfs with masses of M A = 0.41 ± 0.07 and M B = 0.30 ± 0.07, which makes this the lowest-mass circumbinary planet system known. The ratio of the separation between the planet and the center of mass to the separation of the two stars is ∼40, so unlike most of the circumbinary planets found by Kepler, the planet does not orbit near the stability limit.

Original languageEnglish
Article number125
JournalAstronomical Journal
Volume152
Issue number5
DOIs
Publication statusPublished - 1 Nov 2016
Externally publishedYes

Fingerprint

planets
planet
stars
lenses
Hubble Space Telescope
light curve
parallax
mass ratios
center of mass
orbits

Keywords

  • gravitational lensing: micro
  • planetary systems

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bennett, D. P., Rhie, S. H., Udalski, A., Gould, A., Tsapras, Y., Kubas, D., ... Zub, M. (2016). The first circumbinary planet found by microlensing: OGLE-2007-BLG-349L(AB)c. Astronomical Journal, 152(5), [125]. https://doi.org/10.3847/0004-6256/152/5/125

The first circumbinary planet found by microlensing : OGLE-2007-BLG-349L(AB)c. / Bennett, D. P.; Rhie, S. H.; Udalski, A.; Gould, A.; Tsapras, Y.; Kubas, D.; Bond, I. A.; Greenhill, J.; Cassan, A.; Rattenbury, N. J.; Boyajian, T. S.; Luhn, J.; Penny, M. T.; Anderson, J.; Abe, F.; Bhattacharya, A.; Botzler, C. S.; Donachie, M.; Freeman, M.; Fukui, A.; Hirao, Y.; Itow, Y.; Koshimoto, N.; Li, M. C A; Ling, C. H.; Masuda, K.; Matsubara, Y.; Muraki, Y.; Nagakane, M.; Ohnishi, K.; Oyokawa, H.; Perrott, Y. C.; Saito, To; Sharan, A.; Sullivan, D. J.; Sumi, T.; Suzuki, D.; Tristram, P. J.; Yonehara, A.; Yock, P. C M; Szymański, M. K.; Soszyński, I.; Ulaczyk, K.; Wyrzykowski; Allen, W.; DePoy, D.; Gal-Yam, A.; Gaudi, B. S.; Han, C.; Monard, I. A G; Ofek, E.; Pogge, R. W.; Street, R. A.; Bramich, D. M.; Dominik, M.; Horne, K.; Snodgrass, C.; Steele, I. A.; Albrow, M. D.; Bachelet, E.; Batista, V.; Beaulieu, J. P.; Brillant, S.; Caldwell, J. A R; Cole, A.; Coutures, C.; Dieters, S.; Prester, D. Dominis; Donatowicz, J.; Fouqué, P.; Hundertmark, M.; Jørgensen, U. G.; Kains, N.; Kane, S. R.; Marquette, J. B.; Menzies, J.; Pollard, K. R.; Ranc, C.; Sahu, K. C.; Wambsganss, J.; Williams, A.; Zub, M.

In: Astronomical Journal, Vol. 152, No. 5, 125, 01.11.2016.

Research output: Contribution to journalArticle

Bennett, DP, Rhie, SH, Udalski, A, Gould, A, Tsapras, Y, Kubas, D, Bond, IA, Greenhill, J, Cassan, A, Rattenbury, NJ, Boyajian, TS, Luhn, J, Penny, MT, Anderson, J, Abe, F, Bhattacharya, A, Botzler, CS, Donachie, M, Freeman, M, Fukui, A, Hirao, Y, Itow, Y, Koshimoto, N, Li, MCA, Ling, CH, Masuda, K, Matsubara, Y, Muraki, Y, Nagakane, M, Ohnishi, K, Oyokawa, H, Perrott, YC, Saito, T, Sharan, A, Sullivan, DJ, Sumi, T, Suzuki, D, Tristram, PJ, Yonehara, A, Yock, PCM, Szymański, MK, Soszyński, I, Ulaczyk, K, Wyrzykowski, Allen, W, DePoy, D, Gal-Yam, A, Gaudi, BS, Han, C, Monard, IAG, Ofek, E, Pogge, RW, Street, RA, Bramich, DM, Dominik, M, Horne, K, Snodgrass, C, Steele, IA, Albrow, MD, Bachelet, E, Batista, V, Beaulieu, JP, Brillant, S, Caldwell, JAR, Cole, A, Coutures, C, Dieters, S, Prester, DD, Donatowicz, J, Fouqué, P, Hundertmark, M, Jørgensen, UG, Kains, N, Kane, SR, Marquette, JB, Menzies, J, Pollard, KR, Ranc, C, Sahu, KC, Wambsganss, J, Williams, A & Zub, M 2016, 'The first circumbinary planet found by microlensing: OGLE-2007-BLG-349L(AB)c', Astronomical Journal, vol. 152, no. 5, 125. https://doi.org/10.3847/0004-6256/152/5/125
Bennett DP, Rhie SH, Udalski A, Gould A, Tsapras Y, Kubas D et al. The first circumbinary planet found by microlensing: OGLE-2007-BLG-349L(AB)c. Astronomical Journal. 2016 Nov 1;152(5). 125. https://doi.org/10.3847/0004-6256/152/5/125
Bennett, D. P. ; Rhie, S. H. ; Udalski, A. ; Gould, A. ; Tsapras, Y. ; Kubas, D. ; Bond, I. A. ; Greenhill, J. ; Cassan, A. ; Rattenbury, N. J. ; Boyajian, T. S. ; Luhn, J. ; Penny, M. T. ; Anderson, J. ; Abe, F. ; Bhattacharya, A. ; Botzler, C. S. ; Donachie, M. ; Freeman, M. ; Fukui, A. ; Hirao, Y. ; Itow, Y. ; Koshimoto, N. ; Li, M. C A ; Ling, C. H. ; Masuda, K. ; Matsubara, Y. ; Muraki, Y. ; Nagakane, M. ; Ohnishi, K. ; Oyokawa, H. ; Perrott, Y. C. ; Saito, To ; Sharan, A. ; Sullivan, D. J. ; Sumi, T. ; Suzuki, D. ; Tristram, P. J. ; Yonehara, A. ; Yock, P. C M ; Szymański, M. K. ; Soszyński, I. ; Ulaczyk, K. ; Wyrzykowski ; Allen, W. ; DePoy, D. ; Gal-Yam, A. ; Gaudi, B. S. ; Han, C. ; Monard, I. A G ; Ofek, E. ; Pogge, R. W. ; Street, R. A. ; Bramich, D. M. ; Dominik, M. ; Horne, K. ; Snodgrass, C. ; Steele, I. A. ; Albrow, M. D. ; Bachelet, E. ; Batista, V. ; Beaulieu, J. P. ; Brillant, S. ; Caldwell, J. A R ; Cole, A. ; Coutures, C. ; Dieters, S. ; Prester, D. Dominis ; Donatowicz, J. ; Fouqué, P. ; Hundertmark, M. ; Jørgensen, U. G. ; Kains, N. ; Kane, S. R. ; Marquette, J. B. ; Menzies, J. ; Pollard, K. R. ; Ranc, C. ; Sahu, K. C. ; Wambsganss, J. ; Williams, A. ; Zub, M. / The first circumbinary planet found by microlensing : OGLE-2007-BLG-349L(AB)c. In: Astronomical Journal. 2016 ; Vol. 152, No. 5.
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abstract = "We present the analysis of the first circumbinary planet microlensing event, OGLE-2007-BLG-349. This event has a strong planetary signal that is best fit with a mass ratio of q ≈ 3.4 × 10-4, but there is an additional signal due to an additional lens mass, either another planet or another star. We find acceptable light-curve fits with two classes of models: two-planet models (with a single host star) and circumbinary planet models. The light curve also reveals a significant microlensing parallax effect, which constrains the mass of the lens system to be M L ≈ 0.7 M⊙. Hubble Space Telescope (HST) images resolve the lens and source stars from their neighbors and indicate excess flux due to the star(s) in the lens system. This is consistent with the predicted flux from the circumbinary models, where the lens mass is shared between two stars, but there is not enough flux to be consistent with the two-planet, one-star models. So, only the circumbinary models are consistent with the HST data. They indicate a planet of mass m c = 80 ± 13 M⊙, orbiting a pair of M dwarfs with masses of M A = 0.41 ± 0.07 and M B = 0.30 ± 0.07, which makes this the lowest-mass circumbinary planet system known. The ratio of the separation between the planet and the center of mass to the separation of the two stars is ∼40, so unlike most of the circumbinary planets found by Kepler, the planet does not orbit near the stability limit.",
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TY - JOUR

T1 - The first circumbinary planet found by microlensing

T2 - OGLE-2007-BLG-349L(AB)c

AU - Bennett, D. P.

AU - Rhie, S. H.

AU - Udalski, A.

AU - Gould, A.

AU - Tsapras, Y.

AU - Kubas, D.

AU - Bond, I. A.

AU - Greenhill, J.

AU - Cassan, A.

AU - Rattenbury, N. J.

AU - Boyajian, T. S.

AU - Luhn, J.

AU - Penny, M. T.

AU - Anderson, J.

AU - Abe, F.

AU - Bhattacharya, A.

AU - Botzler, C. S.

AU - Donachie, M.

AU - Freeman, M.

AU - Fukui, A.

AU - Hirao, Y.

AU - Itow, Y.

AU - Koshimoto, N.

AU - Li, M. C A

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Muraki, Y.

AU - Nagakane, M.

AU - Ohnishi, K.

AU - Oyokawa, H.

AU - Perrott, Y. C.

AU - Saito, To

AU - Sharan, A.

AU - Sullivan, D. J.

AU - Sumi, T.

AU - Suzuki, D.

AU - Tristram, P. J.

AU - Yonehara, A.

AU - Yock, P. C M

AU - Szymański, M. K.

AU - Soszyński, I.

AU - Ulaczyk, K.

AU - Wyrzykowski,

AU - Allen, W.

AU - DePoy, D.

AU - Gal-Yam, A.

AU - Gaudi, B. S.

AU - Han, C.

AU - Monard, I. A G

AU - Ofek, E.

AU - Pogge, R. W.

AU - Street, R. A.

AU - Bramich, D. M.

AU - Dominik, M.

AU - Horne, K.

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Albrow, M. D.

AU - Bachelet, E.

AU - Batista, V.

AU - Beaulieu, J. P.

AU - Brillant, S.

AU - Caldwell, J. A R

AU - Cole, A.

AU - Coutures, C.

AU - Dieters, S.

AU - Prester, D. Dominis

AU - Donatowicz, J.

AU - Fouqué, P.

AU - Hundertmark, M.

AU - Jørgensen, U. G.

AU - Kains, N.

AU - Kane, S. R.

AU - Marquette, J. B.

AU - Menzies, J.

AU - Pollard, K. R.

AU - Ranc, C.

AU - Sahu, K. C.

AU - Wambsganss, J.

AU - Williams, A.

AU - Zub, M.

PY - 2016/11/1

Y1 - 2016/11/1

N2 - We present the analysis of the first circumbinary planet microlensing event, OGLE-2007-BLG-349. This event has a strong planetary signal that is best fit with a mass ratio of q ≈ 3.4 × 10-4, but there is an additional signal due to an additional lens mass, either another planet or another star. We find acceptable light-curve fits with two classes of models: two-planet models (with a single host star) and circumbinary planet models. The light curve also reveals a significant microlensing parallax effect, which constrains the mass of the lens system to be M L ≈ 0.7 M⊙. Hubble Space Telescope (HST) images resolve the lens and source stars from their neighbors and indicate excess flux due to the star(s) in the lens system. This is consistent with the predicted flux from the circumbinary models, where the lens mass is shared between two stars, but there is not enough flux to be consistent with the two-planet, one-star models. So, only the circumbinary models are consistent with the HST data. They indicate a planet of mass m c = 80 ± 13 M⊙, orbiting a pair of M dwarfs with masses of M A = 0.41 ± 0.07 and M B = 0.30 ± 0.07, which makes this the lowest-mass circumbinary planet system known. The ratio of the separation between the planet and the center of mass to the separation of the two stars is ∼40, so unlike most of the circumbinary planets found by Kepler, the planet does not orbit near the stability limit.

AB - We present the analysis of the first circumbinary planet microlensing event, OGLE-2007-BLG-349. This event has a strong planetary signal that is best fit with a mass ratio of q ≈ 3.4 × 10-4, but there is an additional signal due to an additional lens mass, either another planet or another star. We find acceptable light-curve fits with two classes of models: two-planet models (with a single host star) and circumbinary planet models. The light curve also reveals a significant microlensing parallax effect, which constrains the mass of the lens system to be M L ≈ 0.7 M⊙. Hubble Space Telescope (HST) images resolve the lens and source stars from their neighbors and indicate excess flux due to the star(s) in the lens system. This is consistent with the predicted flux from the circumbinary models, where the lens mass is shared between two stars, but there is not enough flux to be consistent with the two-planet, one-star models. So, only the circumbinary models are consistent with the HST data. They indicate a planet of mass m c = 80 ± 13 M⊙, orbiting a pair of M dwarfs with masses of M A = 0.41 ± 0.07 and M B = 0.30 ± 0.07, which makes this the lowest-mass circumbinary planet system known. The ratio of the separation between the planet and the center of mass to the separation of the two stars is ∼40, so unlike most of the circumbinary planets found by Kepler, the planet does not orbit near the stability limit.

KW - gravitational lensing: micro

KW - planetary systems

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JF - Astronomical Journal

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