干旱区生态环境知识资源中心(Arid): MuSCAT2 multicolour validation of TESS candidates: an ultra-short-period substellar object around an M dwarf

Arid

DOI	10.1051/0004-6361/201935958
	MuSCAT2 multicolour validation of TESS candidates: an ultra-short-period substellar object around an M dwarf
	Parviainen, H.1,2; Palle, E.1,2; Zapatero-Osorio, M. R.3; Montanes Rodriguez, P.1; Murgas, F.1,2; Narita, N.2,4,5,6,7,8; Hidalgo Soto, D.1,2; Bejar, V. J. S.1,2; Korth, J.9; Monelli, M.1,2; Casasayas Barris, N.1,2; Crouzet, N.10; de Leon, J. P.; Fukui, A.; Hernandez, A.1,2; Klagyivik, P.1,2; Kusakabe, N.; Luque, R.1,2; Mori, M.; Nishiumi, T.11; Prieto-Arranz, J.1,2; Tamura, M.; Watanabe, N.; Burke, C.12,13; Charbonneau, D.14; Collins, K. A.14; Collins, K. I.15; Conti, D.16; Garcia Soto, A.17; Jenkins, J. S.18; Jenkins, J. M.19; Levine, A.; Li, J.20; Rinehart, S.21; Seager, S.22,23,24; Tenenbaum, P.20; Ting, E. B.; Vanderspek, R.12,13; Vezie, M.12,13; Winn, J. N.24
通讯作者	Parviainen, H.
来源期刊	ASTRONOMY & ASTROPHYSICS
ISSN	0004-6361
EISSN	1432-0746
出版年	2020
卷号	633
英文摘要	Context. We report the discovery of TOI 263.01 (TIC 120916706), a transiting substellar object (R = 0.87 R-Jup) orbiting a faint M3.5 V dwarf (V = 18.97) on a 0.56 d orbit.Aims. We setout to determine the nature of the Transiting Exoplanet Survey Satellite (TESS) planet candidate TOI 263.01 using ground-based multicolour transit photometry. The host star is faint, which makes radial-velocity confirmation challenging, but the large transit depth makes the candidate suitable for validation through multicolour photometry.Methods. Our analysis combines three transits observed simultaneously in r, i ', and z(s) bands usingthe MuSCAT2 multicolour imager, three LCOGT-observed transit light curves in g ', r ', and i ' bands, a TESS light curve from Sector 3, and a low-resolution spectrum for stellar characterisation observed with the ALFOSC spectrograph. We modelled the light curves with PYTRANSIT using a transit model that includes a physics-based light contamination component, allowing us to estimate the contamination from unresolved sources from the multicolour photometry. Using this information we were able to derive the true planet-star radius ratio marginalised over the contamination allowed by the photometry.Combining this with the stellar radius, we were able to make a reliable estimate of the absolute radius of the object.Results. The ground-based photometry strongly excludes contamination from unresolved sources with a significant colour difference to TOI 263. Furthermore, contamination from sources of the same stellar type as the host is constrained to levels where the true radius ratio posterior has a median of 0.217 and a 99 percentile of0.286. The median and maximum radius ratios correspond to absolute planet radii of 0.87 and 1.41 R-Jup, respectively,which confirms the substellar nature of the planet candidate. The object is either a giant planetor a brown dwarf (BD) located deep inside the so-called brown dwarf desert. Both possibilities offer a challenge to current planet/BD formation models and make TOI 263.01 an object that merits in-depth follow-up studies.
英文关键词	stars: individual: TIC 120916706 planets and satellites: general methods: statistical techniques: photometric
类型	Article
语种	英语
国家	Spain ; Japan ; Germany ; Netherlands ; USA ; Chile
开放获取类型	Green Submitted, Bronze
收录类别	SCI-E
WOS记录号	WOS:000505741300003
WOS关键词	BROWN DWARF ; PLANETS ; EFFICIENT ; EXOPLANETS ; SYSTEM ; STARS ; YOUNG
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
EI主题词	2020-01-03
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312382
作者单位	1.IAC, Tenerife 38200, Spain; 2.ULL, Dept Astrofis, Tenerife 38206, Spain; 3.CSIC, Ctr Astrobiol, INTA, Carretera Ajalvir Km 4, Madrid 28850, Spain; 4.Univ Tokyo, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan; 5.Astrobiol Ctr, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan; 6.PRESTO, Japan Sci & Technol Agcy, 7-3-1 Hongo, Tokyo 1130033, Japan; 7.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan; 8.Univ Tokyo, Dept Earth & Planetary Sci, Tokyo, Japan; 9.Rhein Inst Umweltforsch Univ Koln, Abt Planetenforschung, Aachener Str 209, D-50931 Cologne, Germany; 10.European Space Agcy, Estec, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands; 11.Kyoto Sangyo Univ, Dept Phys, Kyoto, Japan; 12.MIT, Dept Phys, Cambridge, MA 02139 USA; 13.MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA; 14.Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA; 15.Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA; 16.Amer Assoc Variable Star Observers, 49 Bay State Rd, Cambridge, MA 02138 USA; 17.Wesleyan Univ, Astron & Phys, Middletown, CT USA; 18.Univ Chile, Dept Astron, Santiago, Chile; 19.NASA Ames Res Ctr, Moffett Field, CA 94035 USA; 20.SETI Inst, 189 Bernardo Ave,Suite 100, Mountain View, CA 94043 USA; 21.NASA Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; 22.MIT, Dept Aeronaut & Astronaut, Cambridge, MA 02139 USA; 23.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA; 24.Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
推荐引用方式 GB/T 7714	Parviainen, H.,Palle, E.,Zapatero-Osorio, M. R.,et al. MuSCAT2 multicolour validation of TESS candidates: an ultra-short-period substellar object around an M dwarf[J],2020,633.
APA	Parviainen, H..,Palle, E..,Zapatero-Osorio, M. R..,Montanes Rodriguez, P..,Murgas, F..,...&Winn, J. N..(2020).MuSCAT2 multicolour validation of TESS candidates: an ultra-short-period substellar object around an M dwarf.ASTRONOMY & ASTROPHYSICS,633.
MLA	Parviainen, H.,et al."MuSCAT2 multicolour validation of TESS candidates: an ultra-short-period substellar object around an M dwarf".ASTRONOMY & ASTROPHYSICS 633(2020).