A Caltech Library Service

TOI-1431b/MASCARA-5b: A Highly Irradiated Ultrahot Jupiter Orbiting One of the Hottest and Brightest Known Exoplanet Host Stars

Addison, Brett C. and Knudstrup, Emil and Wong, Ian and Hébrard, Guillaume and Dorval, Patrick and Snellen, Ignas and Albrecht, Simon and Bello-Arufe, Aaron and Almenara, Jose-Manuel and Boisse, Isabelle and Bonfils, Xavier and Dalal, Shweta and Demangeon, Olivier D. S. and Hoyer, Sergio and Kiefer, Flavien and Santos, N. C. and Nowak, Grzegorz and Luque, Rafael and Stangret, Monika and Palle, Enric and Tronsgaard, René and Antoci, Victoria and Buchhave, Lars A. and Günther, Maximilian N. and Daylan, Tansu and Murgas, Felipe and Parviainen, Hannu and Esparza-Borges, Emma and Crouzet, Nicolas and Narita, Norio and Fukui, Akihiko and Kawauchi, Kiyoe and Watanabe, Noriharu and Rabus, Markus and Johnson, Marshall C. and Otten, Gilles P. P. L. and Jan Talens, Geert and Cabot, Samuel H. C. and Fischer, Debra A. and Grundahl, Frank and Fredslund Andersen, Mads and Jessen-Hansen, Jens and Pallé, Pere and Shporer, Avi and Ciardi, David R. and Clark, Jake T. and Wittenmyer, Robert A. and Wright, Duncan J. and Horner, Jonathan and Collins, Karen A. and Jensen, Eric L. N. and Kielkopf, John F. and Schwarz, Richard P. and Srdoc, Gregor and Yilmaz, Mesut and Senavci, Hakan Volkan and Diamond, Brendan and Harbeck, Daniel and Komacek, Thaddeus D. and Smith, Jeffrey C. and Wang, Songhu and Eastman, Jason D. and Stassun, Keivan G. and Latham, David W. and Vanderspek, Roland and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Louie, Dana R. and Bouma, Luke G. and Twicken, Joseph D. and Levine, Alan M. and McLean, Brian (2021) TOI-1431b/MASCARA-5b: A Highly Irradiated Ultrahot Jupiter Orbiting One of the Hottest and Brightest Known Exoplanet Host Stars. Astronomical Journal, 162 (6). Art. No. 292. ISSN 0004-6256. doi:10.3847/1538-3881/ac224e.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Accepted Version
Creative Commons Attribution Non-commercial No Derivatives.


Use this Persistent URL to link to this item:


We present the discovery of a highly irradiated and moderately inflated ultrahot Jupiter, TOI-1431b/MASCARA-5 b (HD 201033b), first detected by NASA’s Transiting Exoplanet Survey Satellite mission (TESS) and the Multi-site All-Sky Camera (MASCARA). The signal was established to be of planetary origin through radial velocity measurements obtained using SONG, SOPHIE, FIES, NRES, and EXPRES, which show a reflex motion of K = 294.1 ± 1.1 m s⁻¹. A joint analysis of the TESS and ground-based photometry and radial velocity measurements reveals that TOI-1431b has a mass of M_p = 3.12 ± 0.18 M_J (990 ± 60 M_⊕), an inflated radius of R_p = 1.49 ± 0.05 R_J (16.7 ± 0.6 R_⊕), and an orbital period of P = 2.650237 ± 0.000003 days. Analysis of the spectral energy distribution of the host star reveals that the planet orbits a bright (V = 8.049 mag) and young (0.29_(-0.19)^(+0.32) Gyr) Am type star with T_(eff) = 7690_(-250)^(+400) K, resulting in a highly irradiated planet with an incident flux of 〈F〉= 7.24_(-0.64)^(+0.68) x 10⁹ erg s⁻¹ cm⁻² (5300_(-470)^(+500) S_⊕) and an equilibrium temperature of T_(eq) = 2370 ± 70 K. TESS photometry also reveals a secondary eclipse with a depth of 127_(-5)^(+4) ppm as well as the full phase curve of the planet's thermal emission in the red-optical. This has allowed us to measure the dayside and nightside temperature of its atmosphere as T_(day) = 3004 ± 64 K and T_(night) = 2583 ± 63 K, the second hottest measured nightside temperature. The planet's low day/night temperature contrast (∼420 K) suggests very efficient heat transport between the dayside and nightside hemispheres. Given the host star brightness and estimated secondary eclipse depth of ∼1000 ppm in the K band, the secondary eclipse is potentially detectable at near-IR wavelengths with ground-based facilities, and the planet is ideal for intensive atmospheric characterization through transmission and emission spectroscopy from space missions such as the James Webb Space Telescope and the Atmospheric Remote-sensing Infrared Exoplanet Large-survey.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Addison, Brett C.0000-0003-3216-0626
Knudstrup, Emil0000-0001-7880-594X
Wong, Ian0000-0001-9665-8429
Hébrard, Guillaume0000-0001-5450-7067
Snellen, Ignas0000-0003-1624-3667
Albrecht, Simon0000-0003-1762-8235
Bello-Arufe, Aaron0000-0003-3355-1223
Almenara, Jose-Manuel0000-0003-3208-9815
Boisse, Isabelle0000-0001-8388-8399
Bonfils, Xavier0000-0001-9003-8894
Demangeon, Olivier D. S.0000-0001-7918-0355
Hoyer, Sergio0000-0003-3477-2466
Santos, N. C.0000-0003-4422-2919
Nowak, Grzegorz0000-0002-7031-7754
Luque, Rafael0000-0002-4671-2957
Stangret, Monika0000-0002-1812-8024
Palle, Enric0000-0003-0987-1593
Tronsgaard, René0000-0003-1001-0707
Antoci, Victoria0000-0002-0865-3650
Buchhave, Lars A.0000-0003-1605-5666
Günther, Maximilian N.0000-0002-3164-9086
Daylan, Tansu0000-0002-6939-9211
Murgas, Felipe0000-0001-9087-1245
Parviainen, Hannu0000-0001-5519-1391
Esparza-Borges, Emma0000-0002-2341-3233
Crouzet, Nicolas0000-0001-7866-8738
Narita, Norio0000-0001-8511-2981
Fukui, Akihiko0000-0002-4909-5763
Kawauchi, Kiyoe0000-0003-1205-5108
Watanabe, Noriharu0000-0002-7522-8195
Rabus, Markus0000-0003-2935-7196
Johnson, Marshall C.0000-0002-5099-8185
Otten, Gilles P. P. L.0000-0002-6717-1977
Jan Talens, Geert0000-0003-4787-2335
Cabot, Samuel H. C.0000-0001-9749-6150
Fischer, Debra A.0000-0003-2221-0861
Grundahl, Frank0000-0002-8736-1639
Fredslund Andersen, Mads0000-0002-9194-8520
Pallé, Pere0000-0003-3803-4823
Shporer, Avi0000-0002-1836-3120
Ciardi, David R.0000-0002-5741-3047
Clark, Jake T.0000-0003-3964-4658
Wittenmyer, Robert A.0000-0001-9957-9304
Wright, Duncan J.0000-0001-7294-5386
Horner, Jonathan0000-0002-1160-7970
Collins, Karen A.0000-0001-6588-9574
Jensen, Eric L. N.0000-0002-4625-7333
Kielkopf, John F.0000-0003-0497-2651
Schwarz, Richard P.0000-0001-8227-1020
Yilmaz, Mesut0000-0002-3276-0704
Senavci, Hakan Volkan0000-0002-8961-277X
Harbeck, Daniel0000-0002-8590-007X
Komacek, Thaddeus D.0000-0002-9258-5311
Smith, Jeffrey C.0000-0002-6148-7903
Wang, Songhu0000-0002-7846-6981
Eastman, Jason D.0000-0003-3773-5142
Stassun, Keivan G.0000-0002-3481-9052
Latham, David W.0000-0001-9911-7388
Vanderspek, Roland0000-0001-6763-6562
Seager, Sara0000-0002-6892-6948
Winn, Joshua N.0000-0002-4265-047X
Jenkins, Jon M.0000-0002-4715-9460
Louie, Dana R.0000-0002-2457-272X
Bouma, Luke G.0000-0002-0514-5538
Twicken, Joseph D.0000-0002-6778-7552
Levine, Alan M.0000-0001-8172-0453
McLean, Brian0000-0002-8058-643X
Alternate Title:TOI-1431b/MASCARA-5b: A Highly Irradiated Ultra-Hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars
Additional Information:© 2021. The American Astronomical Society. Received 2021 April 11; revised 2021 August 11; accepted 2021 August 26; published 2021 December 6. Based on observations made with the Hertzsprung SONG telescope operated on the Spanish Observatorio del Teide on the island of Tenerife by the Aarhus and Copenhagen Universities and by the Instituto de Astrofísica de Canarias. Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (grant agreement no.: DNRF106). Based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofisica de Canarias under programs 59-210, 59-503, and 61-804. Based on observations collected with the SOPHIE spectrograph on the 1.93 m telescope at the Observatoire de Haute-Provence (CNRS), France. This article is based on observations made with the MuSCAT2 instrument, developed by ABC, at Telescopio Carlos Sánchez operated on the island of Tenerife by the IAC in the Spanish Observatorio del Teide. This work makes use of observations from the LCOGT network. LCOGT telescope time was granted by NOIRLab through the Mid-Scale Innovations Program (MSIP). MSIP is funded by NSF. B.A. is supported by Australian Research Council Discovery Grant DP180100972. The SONG telescope network is partially supported by the Australian Research Council Linkage, Infrastructure, Equipment and Facilities grant LE190100036. V.A. was supported by a research grant (00028173) from VILLUM FONDEN. I.W. is supported by a Heising–Simons 51 Pegasi b postdoctoral fellowship. Funding for the TESS mission is provided by NASA's Science Mission directorate. We acknowledge the use of public TESS Alert data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. This research has made use of the Exoplanet Follow-up Observation Program website, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. This paper includes data collected by the TESS mission, which are publicly available from the Mikulski Archive for Space Telescopes (MAST). T.D. acknowledges support from MIT's Kavli Institute as a Kavli postdoctoral fellow. M.Y. and H.V.S. acknowledge the support by the research fund of Ankara University (BAP) through the project 18A0759001. This work was supported by Fundação para a Ciência e a Tecnologia (FCT) and Fundo Europeu de Desenvolvimento Regional (FEDER) via COMPETE2020 through the research grants UIDB/04434/2020, UIDP/04434/2020, PTDC/FIS-AST/32113/2017 and POCI-01-0145-FEDER-032113, PTDC/FIS-AST/28953/2017 and POCI-01-0145-FEDER-028953. O.D.S.D. is supported in the form of work contract (DL 57/2016/CP1364/CT0004) funded by FCT. This work was supported by FCT—Fundação para a Ciência e a Tecnologia through national funds and by FEDER through COMPETE2020—Programa Operacional Competitividade e Internacionalização by these grants: UID/FIS/04434/2019; UIDB/04434/2020; UIDP/04434/2020; PTDC/FIS-AST/32113/2017 and POCI-01-0145-FEDER-032113; PTDC/FIS-AST/28953/2017 and POCI-01-0145-FEDER-028953; PTDC/FIS-AST/28987/2017 and POCI-01-0145-FEDER-028987. S.H. acknowledges CNES funding through the grant 837319. G.H. and I.B. received funding from the French Programme National de Planétologie (PNP) of CNRS (INSU). This work is partly supported by JSPS KAKENHI Grant Nos. JP18H01265 and JP18H05439, and JST PRESTO grant No. JPMJPR1775, and a University Research Support Grant from the National Astronomical Observatory of Japan (NAOJ). M.N.G. acknowledges support from MIT's Kavli Institute as a Juan Carlos Torres Fellow. T.D.K. acknowledges support from the 51 Pegasi b Fellowship in Planetary Astronomy sponsored by the Heising–Simons Foundation. D.R.L. is supported by an appointment to the NASA Postdoctoral Program at NASA Goddard Space Flight Center, administered by Universities Space Research Association under contract with NASA. Facilities: TESS - , SONG - , SOPHIE - , NRES ELP - , NRES TLV - , FIES - , EXPRES - , LCOGT - , MuSCAT2 - , MASCARA - . Software: AstroImageJ (Collins et al. 2017), TAPIR (Jensen 2013), Allesfitter (Günther & Daylan 2019, 2021), EXOFASTv2 (Eastman et al. 2013, 2019; Eastman 2017), Astropy (Astropy Collaboration et al. 2018), Matplotlib (Hunter 2007), Wotan (Hippke et al. 2019).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Danish National Research FoundationDNRF106
Australian Research CouncilDP180100972
Australian Research CouncilLE190100036
Heising-Simons Foundation51 Pegasi b Fellowship
MIT Kavli Institute for Astrophysics and Space ResearchUNSPECIFIED
Ankara University18A0759001
Fundação para a Ciência e a Tecnologia (FCT)UIDB/04434/2020
Fundação para a Ciência e a Tecnologia (FCT)UIDP/04434/2020
Fundação para a Ciência e a Tecnologia (FCT)PTDC/FIS-AST/32113/2017
Fundo Europeu de Desenvolvimento Regional (FEDER)POCI-01-0145-FEDER-032113
Fundação para a Ciência e a Tecnologia (FCT)PTDC/FIS-AST/28953/2017
Fundo Europeu de Desenvolvimento Regional (FEDER)POCI-01-0145-FEDER-028953
Fundação para a Ciência e a Tecnologia (FCT)DL 57/2016/CP1364/CT0004
Fundação para a Ciência e a Tecnologia (FCT)UID/FIS/04434/2019
Fundação para a Ciência e a Tecnologia (FCT)PTDC/FIS-AST/28987/2017
Fundo Europeu de Desenvolvimento Regional (FEDER)POCI-01-0145-FEDER-028987
Centre National d'Études Spatiales (CNES)837319
Programme National de Planetologie (PNP)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Japan Society for the Promotion of Science (JSPS)JP18H01265
Japan Society for the Promotion of Science (JSPS)JP18H05439
Japan Science and Technology AgencyJPMJPR1775
National Astronomical Observatory of JapanUNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:Exoplanets; Hot Jupiters; Transit photometry; Radial velocity
Issue or Number:6
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanets (498); Hot Jupiters (753); Transit photometry (1709); Radial velocity (1332)
Record Number:CaltechAUTHORS:20211207-393289000
Persistent URL:
Official Citation:Brett C. Addison et al 2021 AJ 162 292
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112251
Deposited By: George Porter
Deposited On:07 Dec 2021 23:33
Last Modified:07 Dec 2021 23:36

Repository Staff Only: item control page