J/AJ/162/292 Radial velocity and transit photometry of TOI-1431 (Addison+, 2021)
TOI-1431b/MASCARA-5b: a highly irradiated ultrahot Jupiter orbiting one of the
hottest and brightest known exoplanet host stars.
Addison B.C., Knudstrup E., Wong I., Hebrard G., Dorval P., Snellen I.,
Albrecht S., Bello-arufe A., Almenara J.-M., Boisse I., Bonfils X.,
Dalal S., Demangeon O.D.S., Hoyer S., Kiefer F., Santos N.C., Nowak G.,
Luque R., Stangret M., Palle E., Tronsgaard R., Antoci V., Buchhave L.A.,
Gunther M.N., Daylan T., Murgas F., Parviainen H., Esparza-borges E.,
Crouzet N., Narita N., Fukui A., Kawauchi K., Watanabe N., Rabus M.,
Johnson M.C., Otten G.P.P.L., Talens G.J., Cabot S.H.C., Fischer D.A.,
Grundahl F., Fredslund Andersen M., Jessen-hansen J., Palle P., Shporer A.,
Ciardi D.R., Clark J.T., Wittenmyer R.A., Wright D.J., Horner J.,
Collins K.A., Jensen E.L.N., Kielkopf J.F., Schwarz R.P., Srdoc G.,
Yilmaz M., Senavci H.V., Diamond B., Harbeck D., Komacek T.D., Smith J.C.,
Wang S., Eastman J.D., Stassun K.G., Latham D.W., Vanderspek R., Seager S.,
Winn J.N., Jenkins J.M., Louie D.R., Bouma L.G., Twicken J.D., Levine A.M.,
Mclean B.
<Astron. J., 162, 292-292 (2021)>
=2021AJ....162..292A 2021AJ....162..292A (SIMBAD/NED BibCode)
ADC_Keywords: Exoplanets; Stars, Am; Photometry, ugriz; Spectra, optical;
Radial velocities
Keywords: Exoplanets; Hot Jupiters; Transit photometry; Radial velocity
Abstract:
We present the discovery of a highly irradiated and moderately
inflated ultrahot Jupiter, TOI-1431b/MASCARA-5 b (HD201033b), 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±1.1m/s. A joint analysis of
the TESS and ground-based photometry and radial velocity measurements
reveals that TOI-1431b has a mass of Mp=3.12±0.18MJ
(990±60M⊕), an inflated radius of Rp=1.49±0.05RJ
(16.7±0.6R⊕), 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=8.049mag) and young (0.29-0.19+0.32Gyr) Am type star with
Teff=7690-250+400K, resulting in a highly irradiated planet with
an incident flux of =7.24-0.64+0.68x109erg/s/cm
(5300-470+500S⊕) and an equilibrium temperature of
Teq=2370±70K. TESS photometry also reveals a secondary eclipse
with a depth of 127-5+4ppm 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
Tday=3004±64K and Tnight=2583±63K, the second hottest
measured nightside temperature. The planet's low day/night temperature
contrast (∼420K) suggests very efficient heat transport between the
dayside and nightside hemispheres. Given the host star brightness and
estimated secondary eclipse depth of ∼1000ppm 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.
Description:
The star TOI-1431 was observed in Sectors 15 (on Camera 2 and CCD chip
number 4) and 16 (on Camera 2 and CCD chip number 3) by Transiting
Exoplanet Survey Satellite (TESS) in 2min cadence mode nearly
continuously between 2019 August 15 and 2019 October 7.
One full transit of TOI-1431b was observed on 2019 December 24-25 with
the CDK14 telescope at Howard Community College. The observations were
taken using alternating 10s exposures in the Sloan g'an d z filters,
starting at 23:02 UT on December 24 at an airmass of 1.2 and finishing
at 02:56 UT on December 25 at an airmass of 2.4.
Two full transits of TOI-1431b were observed with MuSCAT2, one on 2020
May 16 and a second one on 2020 May 24, using simultaneous multicolor
photometry in g',r', i' and z bands.
A full transit of TOI-1431b was observed with the 0.8m Prof. Dr.
Berahitdin Albayrak Telescope (T80) at the AUKR on 2020 June 16 in the
Sloan z band.
We used the 0.3m telescope at the Kotizarovci Observatory near
Viskovo, Croatia, to observe a full transit of TOI-1431b on 2020
August 8.
On 2020 September 20, we observed a full transit of TOI-1431b from the
0.6m ULMT at Mt Lemmon using the Sloan z' filter.
A full transit of TOI-1431b was observed on 2020 October 14 from the
LCOGT 1.0m network node at McDonald Observatory near Fort Davis, Texas
(LCO-McD), in PANSTARRS Y band.
High-resolution spectroscopic observations of TOI-1431 were obtained
using the robotic Stellar Observations Network Group (SONG) 1m
Hertzsprung telescope at the Teide Observatory in Tenerife. (R=90000
between 4400 and 6900Å).
TOI-1431 was observed with the fiber-fed SOPHIE HR echelle
spectrograph on the 1.93m telescope at the Haute-Provence Observatory
between 2019 December 18 and 2020 January 12. (R=75000 at 5500Å).
We acquired 52 spectra of TOI-1431 using the Fibre-fed Echelle
Spectrograph (FIES) at the 2.56m Nordic Optical Telescope (NOT) of
Roque de los Muchachos Observatory (La Palma, Spain). (R=67000 at
3760-8220Å).
We triggered observations of TOI-1431 on the Network of Robotic
Echelle Spectrographs (NRES) operated by the LCOGT. (R=53000 between
380 and 860nm).
We observed TOI-1431 with the Extreme Precision Spectrometer (EXPRES),
which was recently commissioned at the 4.3m Lowell Discovery
Telescope. (R∼137500 between 380 and 780nm).
Objects:
---------------------------------------------------------------
RA (2000) DE Designation(s) (Period)
---------------------------------------------------------------
21 04 48.86 +55 35 16.5 TOI-1431 = HD 201033 (P=2.650237d)
---------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 34 107 Radial velocity measurements
fig3.dat 53 1281 Ground-based transit photometry of TOI-1431b
with CDK14 and MuSCAT2
fig4.dat 44 1678 Ground-based transit photometry of TOI-1431b
with AUKR, SCT, ULMT, and LCO
fig10.dat 51 32781 TESS Sector 15 and 16 single-scale MAP
corrected PDC photometry of TOI-1431b
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See also:
III/162 : General Catalogue of Ap and Am stars (Renson+ 1991)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
J/ApJ/757/161 : Spectroscopy of 56 exoplanet host stars (Torres+, 2012)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/A+A/574/A116 : G and K giant stars stellar parameters (Reffert+, 2015)
J/ApJ/822/86 : False positive probabilities Q1-Q17 DR24 KOIs (Morton+, 2016)
J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)
J/A+A/608/A93 : K2-106 radial velocities measurements (Guenther+, 2017)
J/A+A/612/A57 : MASCARA-2 b (HD185603) light curves and spectra (Talens+, 2018)
J/AJ/156/18 : APOGEE DR14:Binary comp. of evolved stars (Price-Whelan+, 2018)
J/A+A/625/A16 : HD 2685 TESS photometry (Jones+, 2019)
J/A+A/630/A89 : WASP-12b and WASP-43b griz light curves (Parviainen+, 2019)
J/AJ/157/31 : Differential photo. & radial velocities HATS-70 (Zhou+, 2019)
J/AJ/157/145 : HIRES RVs of three compact, multiplanet systems (Mills+, 2019)
J/AJ/157/149 : Transit parameters for planets around subgiants (Luhn+, 2019)
J/AJ/158/109 : Occurrence rates of planets orbiting FGK stars (Hsu+, 2019)
J/AJ/158/141 : Differential photo. & RVs of HAT-P-69 & HAT-P-70 (Zhou+, 2019)
J/AJ/159/145 : RVs & opt. photometry of the host star TOI-677 (Jordan+, 2020)
J/AJ/159/187 : 1st RVs with the EXPRES spectrograph: 51Peg (Petersburg+, 2020)
J/AJ/159/242 : Velocities & transit times in Kepler-88 system (Weiss+, 2020)
J/AJ/160/96 : CORALIE and PFS radial velocities of HD 86226 (Teske+, 2020)
J/AJ/160/155 : Light curve segments of 22 host stars with TESS (Wong+, 2020)
J/AJ/160/235 : Optical photometry & RVs of TOI-481b & TOI-892b (Brahm+, 2020)
J/A+A/647/A49 : Chemical analysis early-type stars with planets (Saffe+, 2021)
J/AJ/161/36 : 117 exoplanets habitable zone with Kepler DR25 (Bryson+, 2021)
J/AJ/161/68 : Obliquities of 150 hot Kepler hosting stars (Louden+, 2021)
J/ApJS/254/39 : Exoplanet candidates from TESS first 2yr obs (Guerrero+, 2021)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d BJD [58805/59060] Barycentric Julian Date BJD-2400000 (1)
14- 21 F8.1 m/s RVel [-25901/168] Radial velocity (2)
23- 27 F5.1 m/s e_RVel [1/140] The 1σ uncertainty in RVel
29- 34 A6 --- Inst Instrument used
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Note (1): The dates for each observation are reported as BJD at the UTC time
at the midpoint of the exposure.
Note (2): FIES and EXPRES radial velocities are given at an arbitrary
zero point.
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Byte-by-byte Description of file: fig3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Inst Instrument identifier
16- 31 F16.8 d BJD [2458842/2458986] Barycentric Julian Date
33- 42 F10.8 --- NFlux [0.98/1.01] Normalized flux
44- 53 F10.8 --- e_NFlux [0.0008/0.003] Uncertainty in NFlux
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Byte-by-byte Description of file: fig4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Inst Instrument identifier
13- 26 F14.6 d BJD [2459017/2459137] Barycentric Julian Date
28- 35 F8.6 --- NFlux [0.98/1.02] Normalized flux
37- 44 F8.6 --- e_NFlux [0.0006/0.004] Uncertainty in NFlux
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Byte-by-byte Description of file: fig10.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Inst Instrument identifier
12- 28 F17.9 d BJD [2458711/2458763] Barycentric Julian Date
30- 38 F9.7 --- NFlux [0.99/1.01] Normalized flux
40- 51 F12.10 --- e_NFlux [0.0003/0.0004] Uncertainty in NFlux
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 10-Mar-2022