ACCESS and LRG-BEASTS: A Precise New Optical Transmission Spectrum of the Ultrahot Jupiter WASP-103b

被引：56

作者：

Kirk, James ^{[1
]}

Rackham, Benjamin, V ^{[2
,3
]}

MacDonald, Ryan J. ^{[4
]}

Lopez-Morales, Mercedes ^{[1
]}

Espinoza, Nestor ^{[5
]}

Lendl, Monika ^{[6
]}

Wilson, Jamie ^{[7
]}

Osip, David J. ^{[8
]}

Wheatley, Peter J. ^{[9
,18
]}

Skillen, Ian ^{[10
]}

Apai, Daniel ^{[11
,12
,13
]}

Bixel, Alex ^{[11
,13
]}

Gibson, Neale P. ^{[14
]}

Jordan, Andres ^{[15
,16
]}

Lewis, Nikole K. ^{[4
]}

Louden, Tom ^{[9
,18
]}

McGruder, Chima D. ^{[1
]}

Nikolov, Nikolay ^{[5
]}

Rodler, Florian ^{[17
]}

Weaver, Ian C. ^{[1
]}

机构：

[1] Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA

[2] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

[3] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[4] Cornell Univ, Dept Astron & Carl Sagan Inst, 122 Sci Dr, Ithaca, NY 14853 USA

[5] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[6] Univ Geneva, Observ Geneve, Geneva, Switzerland

[7] Queens Univ Belfast, Astrophys Res Ctr, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland

[8] Carnegie Inst Sci, Las Campanas Observ, Casilla 601, La Serena, Chile

[9] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

[10] Isaac Newton Grp Telescopes, Apartado Correos 321, E-38700 Santa Cruz De La Palma, Spain

[11] Univ Arizona, Dept Astron, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA

[12] Univ Arizona, Lunar & Planetary Lab, 1640 E Univ Blvd, Tucson, AZ 85721 USA

[13] NASA Nexus Exoplanet Syst Sci, Earths Other Solar Syst Team, Mountain View, CA USA

[14] Univ Dublin, Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland

[15] Univ Adolfo Ibanez, Fac Ingenierfa & Ciencias, Av Diagonal Tones 2640, Santiago, Chile

[16] Millennium Inst Astrophys, Santiago, Chile

[17] European Southern Observ, Alonso Cordova 3107, Santiago, Chile

[18] Univ Warwick, Ctr Exoplanets & Habitabil, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

来源：

ASTRONOMICAL JOURNAL | 2021年 / 162卷 / 01期

关键词：

GAS-GIANT EXOPLANET; HOT JUPITERS; ATMOSPHERES; TRANSIT; PLANET; EFFICIENT; SPECTROSCOPY; RETRIEVAL; CHEMISTRY; EXPLAIN;

D O I：

10.3847/1538-3881/abfcd2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a new ground-based optical transmission spectrum of the ultrahot Jupiter WASP-103b (Teq=2484 <i K). Our transmission spectrum is the result of combining five new transits from the ACCESS survey and two new transits from the LRG-BEASTS survey with a reanalysis of three archival Gemini/GMOS transits and one VLT/FORS2 transit. Our combined 11-transit transmission spectrum covers a wavelength range of 3900-9450 angstrom with a median uncertainty in the transit depth of 148 parts per million, which is less than one atmospheric scale height of the planet. In our retrieval analysis of WASP-103b's combined optical and infrared transmission spectrum, we find strong evidence for unocculted bright regions (4.3 sigma) and weak evidence for H2O (1.9 sigma <i ), HCN (1.7 sigma <i ), and TiO (2.1 sigma <i ), which could be responsible for WASP-103b's observed temperature inversion. Our optical transmission spectrum shows significant structure that is in excellent agreement with the extensively studied ultrahot Jupiter WASP-121b, for which the presence of VO has been inferred. For WASP-103b, we find that VO can only provide a reasonable fit to the data if its abundance is implausibly high and we do not account for stellar activity. Our results highlight the precision that can be achieved by ground-based observations and the impacts that stellar activity from F-type stars can have on the interpretation of exoplanet transmission spectra.

引用

页数：26

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