J/AJ/162/215 TESS-Keck survey.V. Radial velocities of HD63935 (Scarsdale+, 2021)
TESS-Keck survey.
V. Twin sub-Neptunes transiting the nearby G star HD 63935.
Scarsdale N., Murphy J.M.A., Batalha N.M., Crossfield I.J.M.,
Dressing C.D., Fulton B., Howard A.W., Huber D., Isaacson H., Kane S.R.,
Petigura E.A., Robertson P., Roy A., Weiss L.M., Beard C., Behmard A.,
Chontos A., Christiansen J.L., Ciardi D.R., Claytor Z.R., Collins K.A.,
Collins K.I., Dai F., Dalba P.A., Dragomir D., Fetherolf T., Fukui A.,
Giacalone S., Gonzales E.J., Hill M.L., Hirsch L.A., Jensen E.L.N.,
Kosiarek M.R., De Leon J.P., Lubin J., Lund M.B., Luque R., Mayo A.W.,
Mocnik T., Mori M., Narita N., Nowak G., Palle E., Rabus M.,
Rosenthal L.J., Rubenzahl R.A., Schlieder J.E., Shporer A., Stassun K.G.,
Twicken J., Wang G., Yahalomi D.A., Jenkins J., Latham D.W., Ricker G.R.,
Seager S., Vanderspek R., Winn J.N.
<Astron. J., 162, 215-215 (2021)>
=2021AJ....162..215S 2021AJ....162..215S (SIMBAD/NED BibCode)
ADC_Keywords: Exoplanets; Stars, G-type; Radial velocities; Optical
Keywords: Mini Neptunes; Radial velocity; Transit photometry
Exoplanet atmospheres
Abstract:
We present the discovery of two nearly identically sized sub-Neptune
transiting planets orbiting HD63935, a bright (V=8.6mag), Sun-like
(Teff=5560K) star at 49pc. TESS identified the first planet, HD63935b
(TOI-509.01), in Sectors 7 and 34. We identified the second signal
(HD63935c) in Keck High Resolution Echelle Spectrometer and Lick
Automated Planet Finder radial velocity data as part of our follow-up
campaign. It was subsequently confirmed with TESS photometry in Sector
34 as TOI-509.02. Our analysis of the photometric and radial velocity
data yielded a robust detection of both planets with periods of
9.0600±0.007 and 21.40±0.0019days, radii of 2.99±0.14 and
2.90±0.13R⊕, and masses of 10.8±1.8 and
11.1±2.4M⊕. We calculated densities for planets b and c
consistent with a few percent of the planet mass in hydrogen/helium
envelopes. We also describe our survey's efforts to choose the best
targets for James Webb Space Telescope atmospheric follow-up. These
efforts suggest that HD 63935 b has the most clearly visible
atmosphere of its class. It is the best target for transmission
spectroscopy (ranked by the transmission spectroscopy metric, a proxy
for atmospheric observability) in the so far uncharacterized parameter
space comprising sub-Neptune-sized (2.6R⊕<Rp<4R⊕),
moderately irradiated (100F⊕<Fp<1000F⊕) planets around G
stars. Planet c is also a viable target for transmission spectroscopy,
and given the indistinguishable masses and radii of the two planets,
the system serves as a natural laboratory for examining the processes
that shape the evolution of sub-Neptune planets.
Description:
Between 2019 August and 2021 February, we obtained 100 spectra of
HD63935 with the Levy Spectrograph, a high-resolution slit-fed optical
(500-620nm) echelle spectrograph on the Automatic Planet Finder (APF)
telescope at Lick Observatory. We observed the star using the W
decker, which has dimensions of 3"x1" and R∼114000 between 374 and
970nm.
Between 2019 August and 2021 March, we obtained 51 high-resolution
spectra of HD63935 with the HIRES instrument on the 10m Keck I
telescope at the W. M. Keck Observatory on Maunakea, Hawaii. We
obtained spectra with the C2 decker, which has dimensions of
14"x0.86" and spectral resolution R∼60000 at 500nm.
Between UT 2019 April 2 and 2019 April 29 we collected 11 spectra of
TOI-509 with the HARPS-N spectrograph (383-693nm, R∼115000) mounted at
the 3.58m Telescopio Nazionale Galileo (TNG) of Roque de los Muchachos
Observatory in La Palma, Spain, under the observing programs
CAT19A_162 (PI:Nowak) and CAT19A_96 (PI:Palle).
Objects:
----------------------------------------------------------------------
RA (2000) DE Designation(s) (Period1) (Period2)
----------------------------------------------------------------------
07 51 42.00 +09 23 09.8 HD 63935 = HD 63935 (P1=9.06d) (P2=21.4d)
----------------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 48 237 Radial velocities
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/ApJ/776/67 : Rotational tracks (van Saders+, 2013)
J/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013)
J/A+A/564/A125 : AGN Torus model comparison of AGN in the CDFS (Buchner+, 2014)
J/A+A/580/A23 : Stroemgren-Crawford uvbyβ photometry cat (Paunzen, 2015)
J/AJ/152/180 : Bolometric fluxes of eclipsing bin in Tycho-2 (Stassun+, 2016)
J/ApJ/825/19 : Mass-radius relationship planets with Rp<4 (Wolfgang+, 2016)
J/ApJS/226/7 : Planet cands discovered using K2's 1st yr (Crossfield+, 2016)
J/AJ/153/71 : Kepler follow-up obs program. I. Imaging (Furlan+, 2017)
J/AJ/153/136 : Planets & their host stars Gaia parallaxes (Stassun+, 2017)
J/AJ/154/107 : California-Kepler Survey. I. 1305 stars (Petigura+, 2017)
J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)
J/ApJ/834/17 : Mass & radius of planets, moons, low mass stars (Chen+, 2017)
J/ApJ/844/102 : KIC star plxs from asteroseismology vs Gaia (Huber+, 2017)
J/A+A/619/L10 : pi Men radial velocity curves (Gandolfi+, 2018)
J/AJ/155/48 : California-Kepler Survey. V. Masses and radii (Weiss+, 2018)
J/ApJS/235/38 : Kepler planetary cand. VIII. DR25 reliability (Thompson+, 2018)
J/ApJS/244/11 : Planet candidates and EBs in K2 campaigns 0-8 (Kruse+, 2019)
J/AJ/159/241 : TESS-Keck Survey. I. HD332231 Radial Velocities (Dalba+, 2020)
J/AJ/159/280 : Gaia-Kepler stellar properties cat.I. KIC stars (Berger+, 2020)
J/ApJ/888/43 : APOGEE-Kepler Cool Dwarf star ages (Claytor+, 2020)
J/AJ/161/56 : The TESS-Keck Survey. II. RVs of TOI-561 (Weiss+, 2021)
J/AJ/161/70 : RVel for WASP-107 with HIRES & CORALIE (Piaulet+, 2021)
J/AJ/161/119 : The TESS-Keck survey. IV. Rvel for WASP-107 (Rubenzahl+, 2021)
J/ApJS/254/39 : Exoplanet candidates from TESS first 2yr obs (Guerrero+, 2021)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD [2458576/2459281] Barycentric Julian Date; TBD
16- 22 A7 --- Tel Telescope and/or instrument identifier (1)
24- 30 F7.2 m/s RVel [-172/26.6] Relative radial velocity
32- 36 F5.2 m/s e_RVel [0.5/19] Uncertainty in RVel
38- 42 F5.3 --- S-Value [0.02/0.38]? MtWilson CaHK S activity indic. (2)
44- 48 F5.3 --- e_S-Value [0.001/0.004]? Uncertainty in S-Value
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Note (1): Instruments as follows:
apf = Automated Planet Finder (138 occurrrences)
hires_j = Keck HIRES (88 occurrences)
HARPS-N = HARPS-N (11 occurrences)
Note (2): Null S-Value fields result from datapoints with low (<400)
detector counts.
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History:
From electronic version of the journal
References:
Dalba et al. Paper I. 2020AJ....159..241D 2020AJ....159..241D Cat. J/AJ/159/241
Weiss et al. Paper II. 2021AJ....161...56W 2021AJ....161...56W Cat. J/AJ/161/56
Dai et al. Paper III. 2020AJ....160..193D 2020AJ....160..193D
Rubenzahl et al. Paper IV. 2021AJ....161..119R 2021AJ....161..119R Cat. J/AJ/161/119
Scarsdale et al. Paper V. 2021AJ....162..215S 2021AJ....162..215S This catalog
MacDougall et al. Paper VI. 2021AJ....162..265M 2021AJ....162..265M Cat. J/AJ/162/265
Lange et al. Paper VII. 2024AJ....167..282L 2024AJ....167..282L Cat. J/AJ/167/282
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Lubin et al. Paper IX. 2022AJ....163..101L 2022AJ....163..101L Cat. J/AJ/163/101
Turtelboom et al. Paper XI. 2022AJ....163..293T 2022AJ....163..293T Cat. J/AJ/163/293
Chontos et al. Paper XII. 2022AJ....163..297C 2022AJ....163..297C
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Hill et al. Paper XIX. 2024AJ....167..151H 2024AJ....167..151H
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(End) Prepared by [AAS], Coralie Fix [CDS], 13-Jan-2022