J/AJ/164/97 TESS-Keck Survey. XIII. TOI-1272 radial velocity (MacDougall+, 2022)
The TESS-Keck Survey.
XIII. An Eccentric Hot Neptune with a Similar-mass Outer Companion around
TOI-1272.
MacDougall M.G., Petigura E.A., Fetherolf T., Beard C., Lubin J., Angelo I.,
Batalha N.M., Behmard A., Blunt S., Brinkman C., Chontos A.,
Crossfield I.J.M., Dai F., Dalba P.A., Dressing C., Fulton B., Giacalone S.,
Hill M.L., Howard A.W., Huber D., Isaacson H., Kane S.R., Kosiarek M.,
Mayo A., Mocnik T., Akana Murphy J.M., Pidhorodetska D., Polanski A.,
Rice M., Robertson P., Rosenthal L.J., Roy A., Rubenzahl R.A., Scarsdale N.,
Turtelboom E.V., Tyler D., Van Zandt J., Weiss L.M., Esparza-Borges E.,
Fukui A., Isogai K., Kawauchi K., Mori M., Murgas F., Narita N.,
Nishiumi T., Palle E., Parviainen H., Watanabe N., Jenkins J.M.,
Latham D.W., Ricker G.R., Seager S., Vanderspek R.K., Winn J.N., Bieryla A.,
Caldwell D.A., Dragomir D.,Fausnaugh M.M., Mireles I., Rodriguez D.R.
<Astron. J., 164, 97 (2022)>
=2022AJ....164...97M 2022AJ....164...97M
ADC_Keywords: Exoplanets; Stars, high-velocity; Spectra, optical;
Radial velocities
Keywords: Exoplanets ; Eccentricity ; Hot Neptunes
Abstract:
We report the discovery of an eccentric hot Neptune and a
non-transiting outer planet around TOI-1272. We identified the
eccentricity of the inner planet, with an orbital period of 3.3days
and Rp,b=4.1±0.2R⊕, based on a mismatch between the observed
transit duration and the expected duration for a circular orbit. Using
ground-based radial velocity (RV) measurements from the HIRES
instrument at the Keck Observatory, we measured the mass of TOI-1272b
to be Mp,b=25±2M⊕. We also confirmed a high eccentricity of
eb=0.34±0.06, placing TOI-1272b among the most eccentric
well-characterized sub-Jovians. We used these RV measurements to also
identify a non-transiting outer companion on an 8.7day orbit with a
similar mass of Mp,csin(i)=27±3M⊕ and ec≲0.35. Dynamically
stable planet-planet interactions have likely allowed TOI-1272b to
avoid tidal eccentricity decay despite the short circularization
timescale expected for a close-in eccentric Neptune. TOI-1272b also
maintains an envelope mass fraction of fenv∼11% despite its high
equilibrium temperature, implying that it may currently be undergoing
photoevaporation. This planet joins a small population of short-period
Neptune-like planets within the "Hot Neptune Desert" with a poorly
understood formation pathway.
Description:
We obtained a high-S/N template spectrum of TOI-1272 with the High
Resolution Echelle Spectrometer (HIRES) instrument at the Keck
Observatory on UT 2020 June 11 with an S/N of 282/pixel at 5000Å.
We also collected 62 spectra of TOI-1272 between UT 2020 February 5
and UT 2021 November 27. On average, the observations had a spectral
resolution of R=50000, using a median exposure time of 900s at
5500Å.
Objects:
----------------------------------------------------------------
RA (2000) DE Designation(s) (Period)
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13 16 47.19 +49 51 39.7 TOI-1272 = UCAC4 700-054656 (P=3.3d)
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 67 62 Radial velocity measurements
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)
J/ApJ/844/102 : KIC star parallaxes from asteroseismology/Gaia (Huber+, 2017)
J/AJ/154/107 : California-Kepler Survey. I. 1305 stars (Petigura+, 2017)
J/AJ/154/228 : Properties of transiting planet's host stars (Sandford+, 2017)
J/AJ/156/147 : RV and activity measurements of Kepler-1656 (Brady+, 2018)
J/AJ/155/255 : Radial velocity & activity measurements HAT-P-11 (Yee+, 2018)
J/AJ/157/97 : Radial velocity measurements K2-3 & GJ3470 (Kosiarek+, 2019)
J/A+A/630/A89 : WASP-12b and WASP-43b griz light curves (Parviainen+, 2019)
J/A+A/624/A15 : Kepler-411 mid-transit times (Sun+, 2019)
J/AJ/159/280 : Gaia-Kepler stellar properties catalog.I. (Berger+, 2020)
J/A+A/644/A127 : LP714-47 (TOI 442) radial velocity curve (Dreizler+, 2020)
J/AJ/159/235 : Radial Velocity jitters in 600 planet host stars (Luhn+, 2020)
J/A+A/650/A145 : TOI-269 b light curves (Cointepas+, 2021)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 yr Obs.Y [2020/2021] ISO8601 compliant timestamp of
observation, year
6-7 I2 "month" Obs.M ISO8601 compliant timestamp of observation, month
9-10 I2 d Obs.D ISO8601 compliant timestamp of observation, day
12-13 I2 h Obs.h ISO8601 compliant timestamp of observation, hour
15-16 I2 min Obs.m ISO8601 compliant timestamp of observation,
minute
18-23 F6.3 s Obs.s ISO8601 compliant timestamp of observation,
second
25- 35 F11.3 d BJD [2458885/2459547] Barycentric Julian date of
observation, rounded
37- 41 A5 --- Inst Instrument used (hires)
43- 49 F7.3 m/s RVel [-25.2/23.8] Radial velocity
51- 55 F5.3 m/s e_RVel [1/3] Uncertainty in RVel
57- 61 F5.3 --- SHK [0.23/0.46] S-index of the CaII H and K lines
63- 67 F5.3 --- e_SHK [0.001] Uncertainty in SHK
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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 Cat. J/AJ/162/215
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
Dalba et al. Paper VIII. 2022AJ....163...61D 2022AJ....163...61D Cat. J/AJ/163/61
Lubin et al. Paper IX. 2022AJ....163..101L 2022AJ....163..101L Cat. J/AJ/163/101
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Chontos et al. Paper XII. 2022AJ....163..297C 2022AJ....163..297C
MacDougall et al. Paper XIII. 2022AJ....164...97M 2022AJ....164...97M This catalog
Van Zandt et al. Paper XIV. 2023AJ....165...60V 2023AJ....165...60V Cat. J/AJ/165/60
MacDougall et al. Paper XV. 2023AJ....166...33M 2023AJ....166...33M Cat. J/AJ/166/33
Murphy et al. Paper XVI. 2023AJ....166..153M 2023AJ....166..153M Cat. J/AJ/166/153
Beard et al. Paper XVII. 2024AJ....167...70B 2024AJ....167...70B Cat. J/AJ/167/70
Desai et al. Paper XVIII. 2024AJ....167..194D 2024AJ....167..194D Cat. J/AJ/167/194
Hill et al. Paper XIX. 2024AJ....167..151H 2024AJ....167..151H
Polanski et al. Paper XX. 2024ApJS..272...32P 2024ApJS..272...32P
Pidhorodetska et al. Paper XXII. 2024AJ....168..135P 2024AJ....168..135P Cat. J/AJ/168/135
(End) Prepared by [AAS], Coralie Fix [CDS], 17-Nov-2022