Precision measurement of a brown dwarf mass in a binary system in the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035
| Autor: | Herald, A, Udalski, A, Bozza, V, Rota, P, Bond, IA, Yee, JC, Sajadian, S, Mroz, P, Poleski, R, Skowron, J, Szymanski, MK, Soszynski, I, Pietrukowicz, P, Kozlowski, S, Ulaczyk, K, Rybicki, KA, Iwanek, P, Wrona, M, Gromadzki, M, Abe, F, Barry, R, Bennett, DP, Bhattacharya, A, Fukui, A, Fujii, H, Hirao, Y, Itow, Y, Kirikawa, R, Kondo, I, Koshimoto, N, Matsubara, Y, Matsumoto, S, Miyazaki, S, Muraki, Y, Olmschenk, G, Ranc, C, Okamura, A, Rattenbury, NJ, Satoh, Y, Sumi, T, Suzuki, D, Silva, SI, Toda, T, Tristram, PJ, Vandorou, A, Yama, H, Beichman, CA, Bryden, G, Novati, SC, Carey, S, Gaudi, BS, Gould, A, Henderson, CB, Johnson, S, Shvartzvald, Y, Zhu, W, Dominik, M, Hundertmark, M, Jorgensen, UG, Longa-Pena, P, Skottfelt, J, Tregloan-Reed, J, Bach-Moller, N, Burgdorf, M, D'Ago, G, Haikala, L, Hitchcock, J, Khalouei, E, Peixinho, N, Rahvar, S, Snodgrass, C, Southworth, J, Spyratos, P, Zang, W, Yang, H, Mao, S, Bachelet, E, Maoz, D, Street, RA, Tsapras, Y, Christie, GW, Cooper, T, de Almeida, L, Jr, DNJ-D, Green, J, Han, C, Hennerley, S, Marmont, A, McCormick, J, Monard, LAG, Natusch, T, Pogge, R, Collaboration, OGLE, Collaboration, MOA, Team, S, Consortium, M, Collaboration, LCOFUN |
|---|---|
| Přispěvatelé: | European Commission, University of St Andrews. School of Physics and Astronomy, University of St Andrews. St Andrews Centre for Exoplanet Science |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
GRAVITATIONAL LENS
FOS: Physical sciences CHEMICAL EVOLUTION Astrophysics::Cosmology and Extragalactic Astrophysics GALACTIC BULGE Q1 general [binaries] QB Astronomy Astrophysics::Solar and Stellar Astrophysics PHOTOMETRY low-mass [stars] QC Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) QB Earth and Planetary Astrophysics (astro-ph.EP) OPTICAL DEPTH Astronomy and Astrophysics 3rd-DAS PLANET CANDIDATE Astrophysics - Astrophysics of Galaxies DIFFERENCE IMAGE-ANALYSIS SPITZER low mass [Stars] QC Physics Astrophysics - Solar and Stellar Astrophysics GIANT PLANETS Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) DISCOVERY micro [gravitational lensing] Astrophysics::Earth and Planetary Astrophysics Astrophysics - Earth and Planetary Astrophysics brown dwarfs |
| Zdroj: | Herald, A, Udalski, A, Bozza, V, Rota, P, Bond, I A, Yee, J C, Sajadian, S, Mroz, P, Poleski, R, Skowron, J, Szymanski, M K, Soszynski, I, Pietrukowicz, P, Kozlowski, S, Ulaczyk, K, Rybicki, K A, Iwanek, P, Wrona, M, Gromadzki, M, Abe, F, Barry, R, Bennett, D P, Bhattacharya, A, Fukui, A, Fujii, H, Hirao, Y, Itow, Y, Kirikawa, R, Kondo, I, Koshimoto, N, Matsubara, Y, Matsumoto, S, Miyazaki, S, Muraki, Y, Olmschenk, G, Ranc, C, Okamura, A, Rattenbury, N J, Satoh, Y, Sumi, T, Suzuki, D, Silva, S I, Toda, T, Tristram, P J, Vandorou, A, Yama, H, Beichman, C A, Bryden, G, Jorgensen, U G, Bach-Moller, N, OGLE Collaboration, MOA Collaboration, Spitzer Team, MINDSTEp Consortium & LCO & FUN Collaboration 2022, ' Precision measurement of a brown dwarf mass in a binary system in the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035 ', Astronomy & Astrophysics, vol. 663, 100 . https://doi.org/10.1051/0004-6361/202243490 Astronomy & Astrophysics |
| ISSN: | 0004-6361 |
| Popis: | Context. Brown dwarfs are poorly understood transition objects between stars and planets, with several competing mechanisms having been proposed for their formation. Mass measurements are generally difficult for isolated objects but also for brown dwarfs orbiting low-mass stars, which are often too faint for spectroscopic follow-up. Aims. Microlensing provides an alternative tool for the discovery and investigation of such faint systems. Here we present the analysis of the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035, which is due to a binary system composed of a brown dwarf orbiting a red dwarf. Methods. Thanks to extensive ground observations and the availability of space observations from Spitzer, it has been possible to obtain accurate estimates of all microlensing parameters, including parallax, source radius and orbital motion of the binary lens. Results. After accurate modeling, we find that the lens is composed of a red dwarf with mass $M_1 = 0.149 \pm 0.010M_\odot$ and a brown dwarf with mass $M_2 = 0.0463 \pm 0.0031M_\odot$, at a projected separation of $a_\perp = 0.585$ au. The system has a peculiar velocity that is typical of old metal-poor populations in the thick disk. Percent precision in the mass measurement of brown dwarfs has been achieved only in a few microlensing events up to now, but will likely become common with the Roman space telescope. Comment: 13 pages, 6 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|