J/AJ/163/82 Radial velocity follow up of TOI-1842 (Wittenmyer+, 2022)
TOI-1842b; A Transiting Warm Saturn Undergoing Reinflation around an Evolving
Subgiant.
Wittenmyer R.A., Clark J.T., Trifonov T., Addison B.C., Wright D.J.,
Stassun K.G., Horner J., Lowson N., Kielkopf J., Kane S.R., Plavchan P.,
Shporer A., Zhang H., Bowler B.P., Mengel M.W., Okumura J., Rabus M.,
Johnson M.C., Harbeck D., Tronsgaard R., Buchhave L.A., Collins K.A.,
Collins K.I., Gan T., Jensen E.L.N., Howell S.B., Furlan E., Gnilka C.L.,
Lester K.V., Matson R.A., Scott N.J., Ricker G.R., Vanderspek R.,
Latham D.W., Seager S., Winn J.N., Jenkins J.M., Rudat A., Quintana E.V.,
Rodriguez D.R., Caldwell D.A., Quinn S.N., Essack Z., Bouma L.G.
<Astron. J., 163, 82 (2022)>
=2022AJ....163...82W 2022AJ....163...82W
ADC_Keywords: Exoplanets; Spectra, optical; Radial velocities
Keywords: Exoplanet detection methods ; Transit photometry ; Radial
velocity ; Extrasolar gaseous giant planets
Abstract:
The imminent launch of space telescopes designed to probe the
atmospheres of exoplanets has prompted new efforts to prioritize the
thousands of transiting planet candidates for follow-up
characterization. We report the detection and confirmation of
TOI-1842b, a warm Saturn identified by TESS and confirmed with
ground-based observations from Minerva-Australis, NRES, and the Las
Cumbres Observatory Global Telescope. This planet has a radius of
1.04-0.05+0.06RJ, a mass of 0.214-0.038+0.040MJ, an
orbital period of 9.5739-0.0001+0.0002days, and an extremely low
density (ρ=0.252±0.091g/cm3). TOI-1842b has among the best
known combinations of large atmospheric scale height (893km) and
host-star brightness (J=8.747mag), making it an attractive target for
atmospheric characterization. As the host star is beginning to evolve
off the main sequence, TOI-1842b presents an excellent opportunity to
test models of gas giant reinflation. The primary transit duration of
only 4.3hr also makes TOI-1842b an easily-schedulable target for
further ground-based atmospheric characterization.
Description:
We carried out the spectroscopic observations of TOI-1842 using the
Minerva-Australis facility. Minerva-Australis consists of an array of
four independently operated 0.7m CDK700 telescopes situated at the
Mount Kent Observatory in Queensland, Australia. Each telescope
simultaneously feeds stellar light via fiber optic cables to a single
KiwiSpec R4-100 high-resolution (R=80000) spectrograph with wavelength
coverage from 480 to 620nm.
We obtained 12 spectra of TOI-1842 using the Network of Robotic
Echelle Spectrographs (NRES) on the Las Cumbres Observatory Grand
Telescope (LCOGT) network. NRES is a set of four identical echelle
spectrograph units at observatory sites around the world. NRES
achieves a resolving power of R∼53000 with continuous coverage over
3900-8600Å.
Objects:
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RA (2000) DE Designation(s) (Period)
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13 27 51.04 +09 01 50.32 TOI-1842 = TOI-1842 (P=9.5739d)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 51 131 Radial velocities for TOI-1842
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)
J/ApJ/720/1118 : i-band photometry of HAT-P-16 (Buchhave+, 2010)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/ApJ/708/1366 : Radial velocities for 61 Vir (Vogt+, 2010)
J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)
J/A+A/536/A71 : Atmospheric parameters of nearby giant stars (Jones+, 2011)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/ApJ/809/25 : Stellar & planet properties for K2 candidates (Montet+, 2015)
J/A+A/574/A116 : G and K giant stars stellar parameters (Reffert+, 2015)
J/AJ/152/182 : iz follow-up photometry HAT-P-65 & HAT-P-66 (Hartman+, 2016)
J/ApJ/831/L6 : Eclipsing binary parallaxes with Gaia data (Stassun+, 2016)
J/A+A/585/A126 : 3 irradiated & bloated hot Jupiters RV and phot. (West+, 2016)
J/ApJ/817/L20 : Wolf 1061 velocities and planet candidates (Wright+, 2016)
J/A+A/599/A3 : WASP 127, 136 and 138 RV and light curves (Lam+, 2017)
J/AJ/153/215 : Photometry and spectroscopy of KELT-11 (Pepper+, 2017)
J/AJ/153/136 : Planets & their host stars with Gaia plxs (Stassun+, 2017)
J/A+A/606/A73 : MASCARA-1b (HD201585) light curves and spectra (Talens+, 2017)
J/AJ/155/89 : California-Kepler Survey (CKS). IV. Planets (Petigura+, 2018)
J/A+A/629/A111 : L 98-59 (TOI 175) HARPS observations (Cloutier+, 2019)
J/A+A/628/A39 : Radial velocities of GJ 357 (Luque+, 2019)
J/AJ/158/177 : Near-resonance in system sub-Neptunes from TESS (Quinn+, 2019)
J/AJ/158/197 : Radial velocities & light curves of KELT-24 (Rodriguez+, 2019)
J/AJ/158/141 : Diff. photometry & RVs of HAT-P-69 & HAT-P-70 (Zhou+, 2019)
J/AJ/160/235 : Optical photometry & RVs of TOI-481b & TOI-892b (Brahm+, 2020)
J/AJ/159/241 : TESS-Keck Survey. I. HD332231 Radial Velocities (Dalba+, 2020)
J/AJ/159/145 : RVs & opt. photometry of the host star TOI-677 (Jordan+, 2020)
J/A+A/646/A131 : Four Jovian planets RV and activity indexes (Jones+, 2021)
J/AJ/161/82 : Photometric & spectro. obs. of TOI-954 and K2-329 (Sha+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- ObsID Observatory identifier; MINERVA Australis or NRES
19- 34 F16.8 d BJD [2458981/2459065] Barycentric Julian Date
36- 41 F6.1 m/s RVel [3109/3797] Radial velocity
43- 46 F4.1 m/d e_RVel [8/68] Error on RVel
48- 51 A4 --- Inst Fiber or telescope used
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History:
From electronic version of the journal
(End) Prepared by Coralie Fix [CDS], 09-May-2022