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THE FIRST SIMULTANEOUS MICROLENSING OBSERVATIONS by TWO SPACE TELESCOPES: SPITZER and SWIFT REVEAL A BROWN DWARF in EVENT OGLE-2015-BLG-1319

Shvartzvald, Y and Li, Z and Udalski, A and Gould, A and Sumi, T and Street, RA and Novati, SC and Hundertmark, M and Bozza, V and Beichman, C and Bryden, G and Carey, S and Drummond, J and Fausnaugh, M and Gaudi, BS and Henderson, CB and Tan, TG and Wibking, B and Pogge, RW and Yee, JC and Zhu, W and Tsapras, Y and Bachelet, E and Dominik, M and Bramich, DM and Cassan, A and Figuera Jaimes, R and Horne, K and Ranc, C and Schmidt, R and Snodgrass, C and Wambsganss, J and Steele, IA and Menzies, J and Mao, S and Poleski, R and Pawlak, M and Szymański, MK and Skowron, J and Mróz, P and Kozłowski, S and Wyrzykowski, L and Pietrukowicz, P and Soszyński, I and Ulaczyk, K and Abe, F and Asakura, Y and Barry, RK and Bennett, DP and Bhattacharya, A and Bond, IA and Freeman, M and Hirao, Y and Itow, Y and Koshimoto, N and Li, MCA and Ling, CH and Masuda, K and Fukui, A and Matsubara, Y and Muraki, Y and Nagakane, M and Nishioka, T and Ohnishi, K and Oyokawa, H and Rattenbury, NJ and Saito, T and Sharan, A and Sullivan, DJ and Suzuki, D and Tristram, PJ and Yonehara, A and Jorgensen, UG and Burgdorf, MJ and Ciceri, S and D'Ago, G and Evans, DF and Hinse, TC and Kains, N and Kerins, E and Korhonen, H and Mancini, L and Popovas, A and Rabus, M and Rahvar, S and Scarpetta, G (2016) THE FIRST SIMULTANEOUS MICROLENSING OBSERVATIONS by TWO SPACE TELESCOPES: SPITZER and SWIFT REVEAL A BROWN DWARF in EVENT OGLE-2015-BLG-1319. Astrophysical Journal, 831 (2). ISSN 0004-637X

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Abstract

© 2016. The American Astronomical Society. All rights reserved.Simultaneous observations of microlensing events from multiple locations allow for the breaking of degeneracies between the physical properties of the lensing system, specifically by exploring different regions of the lens plane and by directly measuring the "microlens parallax." We report the discovery of a 30-65M J brown dwarf orbiting a K dwarf in the microlensing event OGLE-2015-BLG-1319. The system is located at a distance of ∼5 kpc toward the Galactic Bulge. The event was observed by several ground-based groups as well as by Spitzer and Swift, allowing a measurement of the physical properties. However, the event is still subject to an eight-fold degeneracy, in particular the well-known close-wide degeneracy, and thus the projected separation between the two lens components is either ∼0.25 au or ∼45 au. This is the first microlensing event observed by Swift, with the UVOT camera. We study the region of microlensing parameter space to which Swift is sensitive, finding that though Swift could not measure the microlens parallax with respect to ground-based observations for this event, it can be important for other events. Specifically, it is important for detecting nearby brown dwarfs and free-floating planets in high magnification events.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Date Deposited: 13 Apr 2017 12:46
Last Modified: 13 Apr 2017 12:46
DOI or Identification number: 10.3847/0004-637X/831/2/183
URI: http://researchonline.ljmu.ac.uk/id/eprint/6260

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