J/AJ/167/194 TESS-Keck Survey. XVIII. TOI-1751 radial velocity (Desai+, 2024)
The TESS-Keck Survey.
XVIII. A Sub-Neptune and Spurious Long-period Signal in the TOI-1751 System.
Desai A., Turtelboom E.V., Harada C.K., Dressing C.D., Rice D.R.,
Murphy J.M.A., Brinkman C.L., Chontos A., Crossfield I.J.M., Dai F.,
Hill M.L., Fetherolf T., Giacalone S., Howard A.W., Huber D., Isaacson H.,
Kane S.R., Lubin J., MacDougall M.G., Mayo A.W., Mocnik T., Polanski A.S.,
Rice M., Robertson P., Rubenzahl R.A., Van Zandt J., Weiss L.M.,
Bieryla A., Buchhave L.A., Jenkins J.M., Kostov V.B., Levine A.M.,
Lillo-Box J., Paegert M., Rabus M., Seager S., Stassun K.G., Ting E.B.,
Watanabe D., Winn J.N.
<Astron. J., 167, 194 (2024)>
=2024AJ....167..194D 2024AJ....167..194D
ADC_Keywords: Stars, metal-deficient ; Spectra, optical ; Radial velocities
Keywords: Radial velocity ; Exoplanet structure ; Transit photometry ;
Mini Neptunes
Abstract:
We present and confirm TOI-1751b, a transiting sub-Neptune orbiting a
slightly evolved, solar-type, metal-poor star (Teff=5996±110K,
logg=4.2±0.1, V=9.3mag, [Fe/H]=-0.40±0.06dex) every 37.47days.
We use TESS photometry to measure a planet radius of
2.7-0.07+0.15R{earth}. We also use both Keck/HIRES and APF/Levy
radial velocities (RV) to derive a planet mass of
14.5-3.14+3.15M{earth}, and thus a planet density of
3.6±0.9g/cm3. There is also a long-period (∼400days) signal that
is observed in only the Keck/HIRES data. We conclude that this
long-period signal is not planetary in nature and is likely due to the
window function of the Keck/HIRES observations. This highlights the
role of complementary observations from multiple observatories to
identify and exclude aliases in RV data. Finally, we investigate the
potential compositions of this planet, including rocky and water-rich
solutions, as well as theoretical irradiated ocean models. TOI-1751b
is a warm sub-Neptune with an equilibrium temperature of ∼820K. As
TOI-1751 is a metal-poor star, TOI-1751b may have formed in a
water-enriched formation environment. We thus favor a volatile-rich
interior composition for this planet.
Description:
The HIgh Resolution Echelle Spectrometer (HIRES) on the Keck I
telescope on Maunakea operates between 360 and 800nm. We used
Keck/HIRES to collect high-resolution spectra of TOI-1751 in order to
derive precision RVs. R=50000.
The Automated Planet Finder (APF) is a robotic 2.4m telescope that
hosts the Levy spectrograph, a high-resolution (R=100000) echelle
spectrograph that operates between 374 and 980nm. We obtained 129
observations of TOI-1751 using APF/Levy between 2020 April and 2023
January, with multiple observations per night on several nights.
Objects:
------------------------------------------------------------
RA (2000) DE Designation(s) (Period)
------------------------------------------------------------
16 13 57.30 +63 32 03.3 TOI-1751 = AG+63 833 (P=37.47d)
------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 59 215 TOI-1751 Radial velocity and S Values
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
VI/120 : High-resolution synthetic stellar library (Coelho+, 2005)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/A+A/546/A10 : Multiplicity transiting planet-host stars (Lillo-Box+, 2012)
J/A+A/566/A103 : Kepler planet host candidates imaging (Lillo-Box+, 2014)
J/ApJ/784/45 : Kepler's multiple planet candidates. III. (Rowe+, 2014)
J/ApJS/210/25 : Transit timing variation 15 planetary pairs. II. (Xie, 2014)
J/AJ/152/180 : Bolometric fluxes eclipsing binaries Tycho-2 (Stassun+, 2016)
J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)
J/AJ/153/71 : Kepler follow-up obs program. I. Imaging (Furlan+, 2017)
J/AJ/154/107 : California-Kepler Survey. I. 1305 stars (Petigura+, 2017)
J/AJ/153/136 : Planets & host stars with Gaia parallaxes (Stassun+, 2017)
J/ApJ/836/77 : Library of high-S/N optical spectra of FGKM stars (Yee+, 2017)
J/AJ/156/264 : California-Kepler Survey. VII. Planet radius (Fulton+, 2018)
J/ApJ/856/23 : BANYAN. XI. The BANYAN Σ algorithm (Gagne+, 2018)
J/AJ/155/136 : Planets orbiting bright stars K2 campaigns 0-10 (Mayo+, 2018)
J/AJ/158/109 : Occurrence rates of planets orbiting FGK stars (Hsu+, 2019)
J/ApJS/250/20 : PRot in TESS objects of interest (TOIs) (Canto+, 2020)
J/ApJS/254/39 : Exoplanet candidates from TESS first 2yr obs (Guerrero+, 2021)
J/AJ/162/75 : Speckle obs TESS exoplanet host stars. II. (Lester+, 2021)
J/A+A/660/A102 : Low-mass multi-planetary systems (Acuna+, 2022)
J/other/Sci/377.1211 : RV and LC of 8 M dwarf stars with planets (Luque+, 2022)
J/ApJS/268/4 : Stellar variab with TESS 2min cadence phot. (Fetherolf+, 2023)
J/AJ/166/33 : The TESS-Keck Survey. XV. 108 TESS Planets (MacDougall+, 2023)
J/AJ/165/60 : TESS-Keck Survey XIV. 2 exoplanets from DGS (Van Zandt+, 2023)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.6 d BJD [1967/3139] Barycentric Julian Date (TBD) of
mid-observation, BJD-2457000
13- 22 F10.6 m/s RVel [-32.2/135] Radial velocity, (1)
24- 32 F9.6 m/s e_RVel [1/34] Uncertainty in RVel (2)
34- 42 F9.6 --- SHK [-0.09/0.32]? Mt. Wilson CaII HK activity index
44- 48 F5.3 --- e_SHK [0.001/0.002]? Error in SHK
50- 59 A10 --- Tel Telescope/Instrument Used; APF or Keck
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Note (1): Model-specific instrumental offsets have not been applied
to the RV values.
Note (2): The RVel errors listed here represent measurement uncertainty
and have not been added in quadrature with the corresponding
instrument jitter values resulting from our models of the data.
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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
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Scarsdale et al. Paper V. 2021AJ....162..215S 2021AJ....162..215S Cat. J/AJ/162/215
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Dalba et al. Paper VIII. 2022AJ....163...61D 2022AJ....163...61D Cat. J/AJ/163/61
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MacDougall et al. Paper XIII. 2022AJ....164...97M 2022AJ....164...97M Cat. J/AJ/164/97
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 This catalog
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], 30-May-2024