SPITZER MICROLENS MEASUREMENT of A MASSIVE REMNANT in A WELL-SEPARATED BINARY

Y. Shvartzvald, A. Udalski, A. Gould, C. Han, V. Bozza, M. Friedmann, M. Hundertmark, C. Beichman, G. Bryden, S. Calchi Novati, S. Carey, M. Fausnaugh, B. S. Gaudi, C. B. Henderson, T. Kerr, R. W. Pogge, W. Varricatt, B. Wibking, J. C. Yee, W. Zhu & 46 others R. Poleski, M. Pawlak, M. K. Szymański, J. Skowron, P. Mróz, S. Kozłowski, [No Value] Wyrzykowski, P. Pietrukowicz, G. Pietrzyński, I. Soszyński, K. Ulaczyk, J. Y. Choi, H. Park, Y. K. Jung, I. G. Shin, M. D. Albrow, B. G. Park, S. L. Kim, C. U. Lee, S. M. Cha, D. J. Kim, Y. Lee, D. Maoz, S. Kaspi, R. A. Street, Y. Tsapras, E. Bachelet, M. Dominik, D. M. Bramich, Keith Horne, C. Snodgrass, I. A. Steele, J. Menzies, R. Figuera Jaimes, J. Wambsganss, R. Schmidt, A. Cassan, C. Ranc, S. Mao, Subo Dong, G. D'Ago, G. Scarpetta, P. Verma, U. G. Jørgensen, E. Kerins, J. Skottfelt

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We report the detection and mass measurement of a binary lens OGLE-2015-BLG-1285La,b, with the more massive component having M1 > 1.35 Mo (80% probability). A main-sequence star in this mass range is ruled out by limits on blue light, meaning that a primary in this mass range must be a neutron star (NS) or black hole (BH). The system has a projected separation r = 6.1 ± 0.4 AU and lies in the Galactic bulge. These measurements are based on the "microlens parallax" effect, i.e., comparing the microlensing light curve as seen from Spitzer, which lay at 1.25 AU projected from Earth, to the light curves from four ground-based surveys, three in the optical and one in the near-infrared. Future adaptive optics imaging of the companion by 30 m class telescopes will yield a much more accurate measurement of the primary mass. This discovery both opens the path and defines the challenges to detecting and characterizing BHs and NSs in wide binaries, with either dark or luminous companions. In particular, we discuss lessons that can be applied to future Spitzer and Kepler K2 microlensing parallax observations.

Original languageEnglish
Article number111
JournalAstrophysical Journal
Volume814
Issue number2
DOIs
Publication statusPublished - 1 Dec 2015

Fingerprint

parallax
light curve
A stars
galactic bulge
main sequence stars
adaptive optics
neutron stars
near infrared
lenses
telescopes
detection
effect

Keywords

  • binaries: general
  • black hole physics
  • Galaxy: bulge
  • gravitational lensing: micro
  • stars: neutron

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Shvartzvald, Y., Udalski, A., Gould, A., Han, C., Bozza, V., Friedmann, M., ... Skottfelt, J. (2015). SPITZER MICROLENS MEASUREMENT of A MASSIVE REMNANT in A WELL-SEPARATED BINARY. Astrophysical Journal, 814(2), [111]. https://doi.org/10.1088/0004-637X/814/2/111

SPITZER MICROLENS MEASUREMENT of A MASSIVE REMNANT in A WELL-SEPARATED BINARY. / Shvartzvald, Y.; Udalski, A.; Gould, A.; Han, C.; Bozza, V.; Friedmann, M.; Hundertmark, M.; Beichman, C.; Bryden, G.; Novati, S. Calchi; Carey, S.; Fausnaugh, M.; Gaudi, B. S.; Henderson, C. B.; Kerr, T.; Pogge, R. W.; Varricatt, W.; Wibking, B.; Yee, J. C.; Zhu, W.; Poleski, R.; Pawlak, M.; Szymański, M. K.; Skowron, J.; Mróz, P.; Kozłowski, S.; Wyrzykowski, [No Value]; Pietrukowicz, P.; Pietrzyński, G.; Soszyński, I.; Ulaczyk, K.; Choi, J. Y.; Park, H.; Jung, Y. K.; Shin, I. G.; Albrow, M. D.; Park, B. G.; Kim, S. L.; Lee, C. U.; Cha, S. M.; Kim, D. J.; Lee, Y.; Maoz, D.; Kaspi, S.; Street, R. A.; Tsapras, Y.; Bachelet, E.; Dominik, M.; Bramich, D. M.; Horne, Keith; Snodgrass, C.; Steele, I. A.; Menzies, J.; Jaimes, R. Figuera; Wambsganss, J.; Schmidt, R.; Cassan, A.; Ranc, C.; Mao, S.; Dong, Subo; D'Ago, G.; Scarpetta, G.; Verma, P.; Jørgensen, U. G.; Kerins, E.; Skottfelt, J.

In: Astrophysical Journal, Vol. 814, No. 2, 111, 01.12.2015.

Research output: Contribution to journalArticle

Shvartzvald, Y, Udalski, A, Gould, A, Han, C, Bozza, V, Friedmann, M, Hundertmark, M, Beichman, C, Bryden, G, Novati, SC, Carey, S, Fausnaugh, M, Gaudi, BS, Henderson, CB, Kerr, T, Pogge, RW, Varricatt, W, Wibking, B, Yee, JC, Zhu, W, Poleski, R, Pawlak, M, Szymański, MK, Skowron, J, Mróz, P, Kozłowski, S, Wyrzykowski, NV, Pietrukowicz, P, Pietrzyński, G, Soszyński, I, Ulaczyk, K, Choi, JY, Park, H, Jung, YK, Shin, IG, Albrow, MD, Park, BG, Kim, SL, Lee, CU, Cha, SM, Kim, DJ, Lee, Y, Maoz, D, Kaspi, S, Street, RA, Tsapras, Y, Bachelet, E, Dominik, M, Bramich, DM, Horne, K, Snodgrass, C, Steele, IA, Menzies, J, Jaimes, RF, Wambsganss, J, Schmidt, R, Cassan, A, Ranc, C, Mao, S, Dong, S, D'Ago, G, Scarpetta, G, Verma, P, Jørgensen, UG, Kerins, E & Skottfelt, J 2015, 'SPITZER MICROLENS MEASUREMENT of A MASSIVE REMNANT in A WELL-SEPARATED BINARY', Astrophysical Journal, vol. 814, no. 2, 111. https://doi.org/10.1088/0004-637X/814/2/111
Shvartzvald Y, Udalski A, Gould A, Han C, Bozza V, Friedmann M et al. SPITZER MICROLENS MEASUREMENT of A MASSIVE REMNANT in A WELL-SEPARATED BINARY. Astrophysical Journal. 2015 Dec 1;814(2). 111. https://doi.org/10.1088/0004-637X/814/2/111
Shvartzvald, Y. ; Udalski, A. ; Gould, A. ; Han, C. ; Bozza, V. ; Friedmann, M. ; Hundertmark, M. ; Beichman, C. ; Bryden, G. ; Novati, S. Calchi ; Carey, S. ; Fausnaugh, M. ; Gaudi, B. S. ; Henderson, C. B. ; Kerr, T. ; Pogge, R. W. ; Varricatt, W. ; Wibking, B. ; Yee, J. C. ; Zhu, W. ; Poleski, R. ; Pawlak, M. ; Szymański, M. K. ; Skowron, J. ; Mróz, P. ; Kozłowski, S. ; Wyrzykowski, [No Value] ; Pietrukowicz, P. ; Pietrzyński, G. ; Soszyński, I. ; Ulaczyk, K. ; Choi, J. Y. ; Park, H. ; Jung, Y. K. ; Shin, I. G. ; Albrow, M. D. ; Park, B. G. ; Kim, S. L. ; Lee, C. U. ; Cha, S. M. ; Kim, D. J. ; Lee, Y. ; Maoz, D. ; Kaspi, S. ; Street, R. A. ; Tsapras, Y. ; Bachelet, E. ; Dominik, M. ; Bramich, D. M. ; Horne, Keith ; Snodgrass, C. ; Steele, I. A. ; Menzies, J. ; Jaimes, R. Figuera ; Wambsganss, J. ; Schmidt, R. ; Cassan, A. ; Ranc, C. ; Mao, S. ; Dong, Subo ; D'Ago, G. ; Scarpetta, G. ; Verma, P. ; Jørgensen, U. G. ; Kerins, E. ; Skottfelt, J. / SPITZER MICROLENS MEASUREMENT of A MASSIVE REMNANT in A WELL-SEPARATED BINARY. In: Astrophysical Journal. 2015 ; Vol. 814, No. 2.
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AU - Shvartzvald, Y.

AU - Udalski, A.

AU - Gould, A.

AU - Han, C.

AU - Bozza, V.

AU - Friedmann, M.

AU - Hundertmark, M.

AU - Beichman, C.

AU - Bryden, G.

AU - Novati, S. Calchi

AU - Carey, S.

AU - Fausnaugh, M.

AU - Gaudi, B. S.

AU - Henderson, C. B.

AU - Kerr, T.

AU - Pogge, R. W.

AU - Varricatt, W.

AU - Wibking, B.

AU - Yee, J. C.

AU - Zhu, W.

AU - Poleski, R.

AU - Pawlak, M.

AU - Szymański, M. K.

AU - Skowron, J.

AU - Mróz, P.

AU - Kozłowski, S.

AU - Wyrzykowski, [No Value]

AU - Pietrukowicz, P.

AU - Pietrzyński, G.

AU - Soszyński, I.

AU - Ulaczyk, K.

AU - Choi, J. Y.

AU - Park, H.

AU - Jung, Y. K.

AU - Shin, I. G.

AU - Albrow, M. D.

AU - Park, B. G.

AU - Kim, S. L.

AU - Lee, C. U.

AU - Cha, S. M.

AU - Kim, D. J.

AU - Lee, Y.

AU - Maoz, D.

AU - Kaspi, S.

AU - Street, R. A.

AU - Tsapras, Y.

AU - Bachelet, E.

AU - Dominik, M.

AU - Bramich, D. M.

AU - Horne, Keith

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Menzies, J.

AU - Jaimes, R. Figuera

AU - Wambsganss, J.

AU - Schmidt, R.

AU - Cassan, A.

AU - Ranc, C.

AU - Mao, S.

AU - Dong, Subo

AU - D'Ago, G.

AU - Scarpetta, G.

AU - Verma, P.

AU - Jørgensen, U. G.

AU - Kerins, E.

AU - Skottfelt, J.

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N2 - We report the detection and mass measurement of a binary lens OGLE-2015-BLG-1285La,b, with the more massive component having M1 > 1.35 Mo (80% probability). A main-sequence star in this mass range is ruled out by limits on blue light, meaning that a primary in this mass range must be a neutron star (NS) or black hole (BH). The system has a projected separation r = 6.1 ± 0.4 AU and lies in the Galactic bulge. These measurements are based on the "microlens parallax" effect, i.e., comparing the microlensing light curve as seen from Spitzer, which lay at 1.25 AU projected from Earth, to the light curves from four ground-based surveys, three in the optical and one in the near-infrared. Future adaptive optics imaging of the companion by 30 m class telescopes will yield a much more accurate measurement of the primary mass. This discovery both opens the path and defines the challenges to detecting and characterizing BHs and NSs in wide binaries, with either dark or luminous companions. In particular, we discuss lessons that can be applied to future Spitzer and Kepler K2 microlensing parallax observations.

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KW - binaries: general

KW - black hole physics

KW - Galaxy: bulge

KW - gravitational lensing: micro

KW - stars: neutron

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