J/A+A/691/A67 TOI-4914, TOI-2714 and TOI-2981 RV curves (Mantovan+, 2024)
The inflated, eccentric warm Jupiter TOI-4914 b orbiting a metal-poor star, and
the hot Jupiters TOI-2714 b and TOI-2981 b.
Mantovan G., Wilson T.G., Borsato L., Zingales T., Biazzo K., Nardiello D.,
Malavolta L., Desidera S., Marzari F., Collier Cameron A., Nascimbeni V.,
Majidi F.Z., Montalto M., Piotto G., Stassun K.G., Winn J.N., Jenkins J.M.,
Mignon L., Bieryla A., Latham D.W., Barkaoui K., Collins K.A., Evans P.,
Fausnaugh M.M., Granata V., Kostov V., Mann A.W., Pozuelos F.J.,
Radford D.J., Relles H.M., Rowden P., Seager S., Tan T.-G., Timmermans M.,
Watkins C.N.
<Astron. Astrophys. 691, A67 (2024)>
=2024A&A...691A..67M 2024A&A...691A..67M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical
Keywords: techniques: photometric - techniques: radial velocities -
planets and satellites: fundamental parameters -
planets and satellites: gaseous planets -
stars: fundamental parameters
Abstract:
Recent observations of giant planets have revealed unexpected bulk
densities. Hot Jupiters, in particular, appear larger than expected
for their masses compared to planetary evolution models, while warm
Jupiters seem denser than expected. These differences are often
attributed to the influence of the stellar incident flux, but could
they also result from different planet formation processes? Is there a
trend linking the planetary density to the chemical composition of the
host star?In this work we present the confirmation of three giant
planets in orbit around solar analogue stars. TOI-2714 b (P~=2.5d,
Rmp~=1.22RmJ, Mmp=0.72MmJ) and TOI-2981 b (P~=3.6d,
Rmp~=1.2RmJ, Mmp=2MmJ) are hot Jupiters on nearly circular
orbits, while TOI-4914 b (P~=10.6d, Rmp~=1.15RmJ, Mmp=0.72MmJ)
is a warm Jupiter with a significant eccentricity (e=0.41±0.02) that
orbits a star more metal-poor ([Fe/H]~=-0.13) than most of the stars
known to host giant planets. Similarly, TOI-2981 b orbits a metal-poor
star ([Fe/H]~=-0.11), while TOI-2714 b orbits a metal-rich star
([Fe/H]~=0.30). Our radial velocity (RV) follow-up with the HARPS
spectrograph allows us to detect their Keplerian signals at high
significance (7, 30, and 23σ, respectively) and to place a
strong constraint on the eccentricity of TOI-4914 b (18σ).
TOI-4914 b, with its large radius (Rmp~=1.15RmJ) and low
insolation flux (Fstar<2x108merg/s/cm2), appears to be more
inflated than what is supported by current theoretical models for
giant planets. Moreover, it does not conform to the previously noted
trend that warm giant planets orbiting metal-poor stars have low
eccentricities. This study thus provides insights into the diverse
orbital characteristics and formation processes of giant exoplanets,
in particular the role of stellar metallicity in the evolution of
planetary systems.
Description:
Observations of TOI-2714, TOI-2981 and TOI-4914 with HARPS at 3.6m
telescope spanning the period between April and September 2023. A
total of 40 spectra, with exposure times of 1800s. These spectra
cover the wavelength range 378-691nm with a resolving power of
R∼115000.
Objects:
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RA (2000) DE Designation(s)
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04 05 36.288 -14 55 36.361 TOI-2714 = TIC 332534326
10 53 56.983 -25 31 28.834 TOI-2981 = TIC 287145649
13 38 10.257 -28 08 34.278 TOI-4914 = UCAC4 310-072971
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 52 3 List of studied stars
tablea1.dat 29 8 TOI-2714: Radial velocity time-series
tablea2.dat 29 15 TOI-2981: Radial velocity time-series
tablea3.dat 29 17 TOI-4914: Radial velocity time-series
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Star name
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 21 F6.3 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 35 F6.3 arcsec DEs Declination (J2000)
37- 52 A16 --- SName Simbad name
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Byte-by-byte Description of file: tablea1.dat tablea2.dat tablea3.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d Time Time, TDB (BJD-2400000)
14- 22 F9.3 m/s RV Radial velocity
24- 29 F6.3 m/s e_RV Radial velocity uncertainty
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Acknowledgements:
Giacomo Mantovan, giacomo.mantovan(at)unipd.it
(End) Giacomo Mantovan [Unipd, Italy], Patricia Vannier [CDS] 12-Sep-2024