OGLE-2016-BLG-1190Lb: The First Spitzer Bulge Planet Lies Near the Planet/Brown-dwarf Boundary

Ryu, Y. -H. and Yee, J. C. and Udalski, A. and Bond, I. A. and Shvartzvald, Y. and Zang, W. and Figuera Jaimes, R. and Jorgensen, U. G. and Zhu, W. and Huang, C. X. ORCID: https://orcid.org/0000-0003-0918-7484 and Jung, Y. K. and Albrow, M. D. and Chung, S. -J. and Gould, A. and Han, C. and Hwang, K. -H. and Shin, I. -G. and Cha, S. -M. and Kim, D. -J. and Kim, H. -W. and Kim, S. -L. and Lee, C. -U. and Lee, D. -J. and Lee, Y. and Park, B. -G. and Pogge, R. W. and Calchi Novati, S. and Carey, S. and Henderson, C. B. and Beichman, C. and Gaudi, B. S. and Mroz, P. and Poleski, R. and Skowron, J. and Szymanski, M. K. and Soszynski, I. and Kozlowski, S. and Pietrukowicz, P. and Ulaczyk, K. and Pawlak, M. and Abe, F. and Asakura, Y. and Barry, R. and Bennett, D. P. and Bhattacharya, A. and Donachie, M. and Evans, P. and Fukui, A. and Hirao, Y. and Itow, Y. and Kawasaki, K. and Koshimoto, N. and Li, M. C. A. and Ling, C. H. and Masuda, K. and Matsubara, Y. and Miyazaki, S. and Muraki, Y. and Nagakane, M. and Ohnishi, K. and Ranc, C. and Rattenbury, N. J. and Saito, To. and Sharan, A. and Sullivan, D. J. and Sumi, T. and Suzuki, D. and Tristram, P. J. and Yamada, T. and Yamada, T. and Yonehara, A. and Bryden, G. and Howell, S. B. and Jacklin, S. and Penny, M. T. and Mao, S. and Fouque, Pascal and Wang, T. and Street, R. A. and Tsapras, Y. and Hundertmark, M. and Bachelet, E. and Dominik, M. and Li, Z. and Cross, S. and Cassan, A. and Horne, K. and Schmidt, R. and Wambsganss, J. and Ment, S. K. and Maoz, D. and Snodgrass, C. and Steele, I. A. and Bozza, V. and Burgdorf, M. J. and Ciceri, S. and D'Ago, G. and Evans, D. F. and Hinse, T. C. and Kerins, E. and Kokotanekova, R. and Longa, P. and MacKenzie, J. and Popovas, A. and Rabus, M. and Rahvar, S. and Sajadian, S. and Skottfelt, J. and Southworth, J. and von Essen, C. (2017) OGLE-2016-BLG-1190Lb: The First Spitzer Bulge Planet Lies Near the Planet/Brown-dwarf Boundary. The Astronomical Journal, 155 (1):40. pp. 1-24. ISSN 0004-6256

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We report the discovery of OGLE-2016-BLG-1190Lb, which is likely to be the first Spitzer microlensing planet in the Galactic bulge/bar, an assignation that can be confirmed by two epochs of high-resolution imaging of the combined source-lens baseline object. The planet's mass, Mp = 13.4 ± 0.9 MJ, places it right at the deuterium-burning limit, i.e., the conventional boundary between 'planets' and 'brown dwarfs.' Its existence raises the question of whether such objects are really 'planets' (formed within the disks of their hosts) or 'failed stars' (low-mass objects formed by gas fragmentation). This question may ultimately be addressed by comparing disk and bulge/bar planets, which is a goal of the Spitzer microlens program. The host is a G dwarf, M host = 0.89 ± 0.07 M o, and the planet has a semimajor axis a ∼ 2.0 au. We use Kepler K2 Campaign 9 microlensing data to break the lens-mass degeneracy that generically impacts parallax solutions from Earth-Spitzer observations alone, which is the first successful application of this approach. The microlensing data, derived primarily from near-continuous, ultradense survey observations from OGLE, MOA, and three KMTNet telescopes, contain more orbital information than for any previous microlensing planet, but not quite enough to accurately specify the full orbit. However, these data do permit the first rigorous test of microlensing orbital-motion measurements, which are typically derived from data taken over <1% of an orbital period.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 01 Apr 2022 00:33
Last Modified: 19 May 2022 01:38
Uncontrolled Keywords: gravitational lensing: micro; Astrophysics - Earth and Planetary Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/1538-3881/aa9be4
URI: http://eprints.usq.edu.au/id/eprint/47382

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