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The first circumbinary planet found by microlensing: OGLE-2007-BLG-349L(AB)c

Bennett, DP and Rhie, SH and Udalski, A and Gould, A and Tsapras, Y and Kubas, D and Bond, IA and Greenhill, J and Cassan, A and Rattenbury, NJ and Boyajian, TS and Luhn, J and Penny, MT and Anderson, J and Abe, F and Bhattacharya, A and Botzler, CS and Donachie, M and Freeman, M and Fukui, A and Hirao, Y and Itow, Y and Koshimoto, N and Li, MCA and Ling, CH and Masuda, K and Matsubara, Y and Muraki, Y and Nagakane, M and Ohnishi, K and Oyokawa, H and Perrott, YC and Saito, T and Sharan, A and Sullivan, DJ and Sumi, T and Suzuki, D and Tristram, PJ and Yonehara, A and Yock, PCM and Szymański, MK and Soszyński, I and Ulaczyk, K and Wyrzykowski, L and Allen, W and DePoy, D and Gal-Yam, A and Gaudi, BS and Han, C and Monard, IAG and Ofek, E and Pogge, RW and Street, RA and Bramich, DM and Dominik, M and Horne, K and Snodgrass, C and Steele, IA and Albrow, MD and Bachelet, E and Batista, V and Beaulieu, JP and Brillant, S and Caldwell, JAR and Cole, A and Coutures, C and Dieters, S and Prester, DD and Donatowicz, J and Fouqué, P and Hundertmark, M and Jørgensen, UG and Kains, N and Kane, SR and Marquette, JB and Menzies, J and Pollard, KR and Ranc, C and Sahu, KC and Wambsganss, J and Williams, A and Zub, M (2016) The first circumbinary planet found by microlensing: OGLE-2007-BLG-349L(AB)c. ASTRONOMICAL JOURNAL, 152 (5). ISSN 0004-6256

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Abstract

© 2016. The American Astronomical Society. All rights reserved.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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 13 Apr 2017 12:42
Last Modified: 12 Sep 2017 23:20
DOI or Identification number: 10.3847/0004-6256/152/5/125
URI: http://researchonline.ljmu.ac.uk/id/eprint/6259

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