J/AJ/160/239 Cluster difference imaging photometric survey. II. (Bouma+, 2020)
Cluster difference imaging photometric survey.
II. TOI 837: a young validated Planet in IC 2602.
Bouma L.G., Hartman J.D., Brahm R., Evans P., Collins K.A., Zhou G.,
Sarkis P., Quinn S.N., de Leon J., Livingston J., Bergmann C., Stassun K.G.,
Bhatti W., Winn J.N., Bakos G.A., Abe L., Crouzet N., Dransfield G.,
Guillot T., Marie-Sainte W., Mekarnia D., Triaud A.H.M.J., Tinney C.G.,
Henning T., Espinoza N., Jordan A., Barbieri M., Nandakumar S., Trifonov T.,
Vines J.I., Vuckovic M., Ziegler C., Law N., Mann A.W., Ricker G.R.,
Vanderspek R., Seager S., Jenkins J.M., Burke C.J., Dragomir D.,
Levine A.M., Quintana E.V., Rodriguez J.E., Smith J.C., Wohler B.
<Astron. J., 160, 239 (2020)>
=2020AJ....160..239B 2020AJ....160..239B
ADC_Keywords: Exoplanets; Stars, G-type; Photometry, RI; Spectra, optical;
Radial velocities
Keywords: Exoplanets ; Transits ; Exoplanet evolution ; Stellar ages ;
Young star clusters
Abstract:
We report the discovery of TOI837b and its validation as a transiting
planet. We characterize the system using data from the NASA Transiting
Exoplanet Survey Satellite mission, the ESA Gaia mission, ground-based
photometry from El Sauce and ASTEP400, and spectroscopy from CHIRON,
FEROS, and Veloce. We find that TOI837 is a T=9.9mag G0/F9 dwarf in
the southern open cluster IC2602. The star and planet are therefore
35-5+11 million years old. Combining the transit photometry with a
prior on the stellar parameters derived from the cluster
color-magnitude diagram, we find that the planet has an orbital period
of 8.3days and is slightly smaller than Jupiter
(Rp=0.77-0.07+0.09RJup). From radial velocity monitoring, we
limit Mpsin(i) to less than 1.20MJup(3σ). The transits
either graze or nearly graze the stellar limb. Grazing transits are a
cause for concern, as they are often indicative of astrophysical
false-positive scenarios. Our follow-up data show that such scenarios
are unlikely. Our combined multicolor photometry, high-resolution
imaging, and radial velocities rule out hierarchical eclipsing binary
scenarios. Background eclipsing binary scenarios, though limited by
speckle imaging, remain a 0.2% possibility. TOI837b is therefore a
validated adolescent exoplanet. The planetary nature of the system can
be confirmed or refuted through observations of the stellar obliquity
and the planetary mass. Such observations may also improve our
understanding of how the physical and orbital properties of exoplanets
change in time.
Description:
We observed four transits with the 0.36m telescope at Observatorio El
Sauce, located in the Rio Hurtado Valley in Chile and operated by
coauthor P.Evans. The observations were obtained in the Cousins-R band
on the nights of 2020 April 1 and 26, the Cousins-I band on the night
of 2020 May 21, and the Johnson-B band on the night of 2020 June 14.
We observed three transits with the 0.40m Antarctic Search for
Transiting Exoplanets (ASTEP) telescope at the Concordia base on the
Antarctic Plateau. The focal instrument's dichroic plate splits the
beam into a blue wavelength channel for guiding and a non-filtered red
science channel roughly matching a Cousins-R transmission curve.
We acquired nine spectra using CHIRON at the SMARTS 1.5m telescope at
the Cerro Tololo Inter-American Observatory (CTIO), Chile. Six met our
signal-to-noise requirements for radial velocities measurements and
stellar parameter extraction. We used CHIRON in its image slicer
configuration, yielding a spectral resolution of ∼79000 across
415-880nm.
TOI837b was monitored with the FEROS echelle spectrograph, mounted on
the MPG 2.2m telescope at the European Southern Observatory's (ESO) La
Silla Observatory in Chile. FEROS has a resolution of ∼48000 across a
spectral range of 350-920nm.
We acquired 34 spectra over 10 visits of TOI837 using the Veloce
spectrograph, mounted on the 3.9m Anglo-Australian Telescope (AAT) at
Siding Spring Observatory near Coonabarabran, Australia. The currently
operational "Veloce Rosso" channel provides coverage from 600 to 950nm
at a spectral resolution of ∼80000.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s) (Period)
----------------------------------------------------------
10 28 08.95 -64 30 18.76 TOI837 = TOI-837 (P=8.3248762d)
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 39 2157 Ground-based TOI 837 photometry
table2.dat 31 29 TOI 837 radial velocities
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)
J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+,2005)
J/AJ/129/2856 : Variable stars in NGC 6791 (Mochejska+, 2005)
J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)
J/AJ/135/907 : Variables Praesepe identified with KELT (Pepper+, 2008)
J/ApJ/720/1118 : i-band photometry of HAT-P-16 (Buchhave+, 2010)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/A+A/537/A146 : Stellar models rot. 0.8<M<120, Z=0.014 (Ekstrom+, 2012)
J/ApJ/756/L33 : RVs of 2 hot Jupiters in Praesepe (Quinn+, 2012)
J/A+A/553/A49 : WASP-19b secondary eclipses (Abe+, 2013)
J/A+A/558/A53 : Milky Way survey star clusters. II. (Kharchenko+, 2013)
J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+,2013)
J/A+A/556/A15 : Effective temperature scale M dwarfs (Rajpurohit+, 2013)
J/A+A/583/A73 : Color-period diagram for M48 (NGC2548) (Barnes+, 2015)
J/ApJ/804/146 : Atmospheric param. for nearby B-F stars (David+, 2015)
J/ApJ/809/77 : Transiting Exoplanet Survey Satellite (Sullivan+, 2015)
J/A+A/588/A118 : Pr0211 RVs, photom. & activity indexes (Malavolta+,2016)
J/ApJ/822/86 : False positive prob. for Q1-Q17 DR24 KOIs (Morton+,2016)
J/A+A/585/A150 : On the metallicity of open clusters.III. (Netopil+,2016)
J/AJ/152/113 : Pleiades members K2 LCs. I. Periods (Rebull+, 2016)
J/A+A/602/A107 : 231 transit. planets eccentricity & mass (Bonomo+, 2017)
J/A+A/603/A85 : M67 stars radial velocities (Brucalassi+, 2017)
J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)
J/ApJ/842/83 : Praesepe members Prot from K2 LCs (Douglas+, 2017)
J/AJ/154/109 : California-Kepler SurveyIII. Planet radii (Fulton+,2017)
J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)
J/AJ/153/136 : Planets and host stars with Gaia plxs (Stassun+, 2017)
J/ApJ/835/61 : Chromospherically active stars RAVE. II. (Zerjal+, 2017)
J/AJ/156/18 : APOGEE DR14: companions of stars (Price-Whelan+, 2018)
J/ApJ/855/115 : Li abundances of KOIs from CKS spectra (Berger+, 2018)
J/A+A/618/A93 : GaiaDR2 open clusters in Milky Way (Cantat-Gaudin+,2018)
J/A+A/619/A116 : New variables & 2 delta Scuti pulsations (Crouzet+,2018)
J/AJ/155/89 : California-Kepler Survey. IV. Planets (Petigura+, 2018)
J/A+A/612/A99 : Gaia-ESO Survey open star cluster fields (Randich+,2018)
J/AJ/156/102 : The TESS Input Catalog and Candidate (Stassun+, 2018)
J/A+A/623/A108 : Age of 269 GDR2 open clusters (Bossini+, 2019)
J/ApJS/245/13 : CDIPS. I. LCs from TESS sectors 6 and 7 (Bouma+, 2019)
J/AJ/158/45 : TESS light curve & RVs for HD1397 (Brahm+, 2019)
J/ApJ/879/49 : Prot for 171 Gaia members of NGC6811 (Curtis+, 2019)
J/AJ/158/77 : Cand. & memb. of Pisces-Eridanus stream (Curtis+, 2019)
J/A+A/623/A112 : The Sco OB2 population from GaiaDR2 data (Damiani+,2019)
J/ApJ/879/100 : K2 Prot for Hyades & Praesepe members (Douglas+, 2019)
J/AJ/158/122 : Structure & star formation history of MW (Kounkel+,2019)
J/A+A/634/A34 : Complete line list and solar values (Baratella+, 2020)
J/AJ/160/108 : Gaia-Kepler stellar properties catalogII (Berger+, 2020)
J/A+A/642/A133 : V830 Tau VI light curves and RV curves (Damasso+, 2020)
J/AJ/159/145 : RVs and opt. photom. host star TOI-677 (Jordan+, 2020)
J/MNRAS/495/4924 : Exoplanets in Southern open clusters (Nardiello+, 2020)
J/AJ/159/273 : Taurus members & nonmembers with K2 data (Rebull+, 2020)
J/AJ/160/192 : Photometry and RVs of K2-25b with HPF (Stefansson+,2020)
J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.6 d BJD [1940/2024] Exposure midtime; BJD,TBD-2457000
13- 20 F8.6 --- flux [0.986945/1.012303] Relative flux
22- 29 F8.6 --- e_flux [0.001406/0.005692] Uncertainty in flux
31- 39 A9 --- Inst Instrument code (1)
--------------------------------------------------------------------------------
Note (1): Each transit for each instrument has an incremental index in the
instrument code. El Sauce transits [0, 1, 2, 3] correspond to
2020.04.01, 2020.04.26, 2020.05.21, and 2020.06.14 respectively.
ASTEP transits [0, 1, 2] correspond to 2020.05.29, 2020.06.14,
and 2020.06.23 respectively. The TESS light curve is available
through MAST.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.6 d BJD [8669/8933] Exposure midtime; BJD,TBD-2450000
13- 18 F6.1 m/s RVel [-196/240] Radial Velocity
20- 24 F5.1 m/s e_RVel [21/726] Error on RVel
26- 31 A6 --- Inst Instrument used (CHIRON, FEROS, or Veloce)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Bouma et al. Paper I : 2019ApJS..245...13B 2019ApJS..245...13B cat. J/ApJS/245/13
(End) Prepared by [AAS], Coralie Fix [CDS], 28-Jan-2021