J/A+A/694/A268 Discovery of 4 warm giants (Tala Pinto+, 2025)
Three warm Jupiters orbiting TOI-6628, TOI-3837, TOI-5027 and one sub-Saturn
orbiting TOI-2328.
Tala Pinto M., Jordan A., Acuna L., Jones M., Brahm R., Reinarz Y.,
Eberhardt J., Espinoza N., Henning T., Hobson M., Rojas F., Schlecker M.,
Trifonov T., Bakos G., Boyle G., Csubry Z., Hartmann J., Knepper B.,
Kreidberg L., Suc V., Teske J., Butler R.P., Crane J., Schectman S.,
Thompson I., Osip D., Ricker G., Collins K.A., Watkins C.N., Bieryla A.,
Stockdale C., Wang G., Zambelli R., Seager S., Winn J., Rose M.E., Rice M.,
Essack Z.
<Astron. Astrophys. 694, A268 (2025)>
=2025A&A...694A.268T 2025A&A...694A.268T (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Spectroscopy ;
Radial velocities ; Optical
Keywords: techniques: radial velocities - planets and satellites: detection -
planets and satellites: gaseous planets -
planets and satellites: interiors
Abstract:
We report the discovery and characterization of three new transiting
giant planets orbiting TOI-6628, TOI-3837 and TOI-5027, and one new
warm sub-Saturn orbiting TOI-2328, whose transits events were detected
in the lightcurves of the Transiting Exoplanet Survey Satellite (TESS)
space mission. By combining TESS lightcurves with ground-based
photometric and spectroscopic follow-up observations, we confirm the
planetary nature of the observed transits and radial velocity
variations.
TOI-6628 b has a mass of 0.74±0.06MJ, a radius of
0.98+0.06-0.05RJ and orbits a metal rich star with a period of
18.18424±0.00001 days and an eccentricity of 0.670+0.015-0.016,
making it one of the most eccentric orbits of all known warm giants.
TOI-3837 b has a mass of 0.59±0.05 MJ, a radius of
0.97+0.05-0.06RJ and orbits its host star every
11.88865±0.00003 days, with a moderate eccentricity of
0.221+0.042-0.046. With a mass of 2.02±0.13MJ and a radius of
0.96+0.05-0.06RJ, TOI-5027 b orbits its host star in an
eccentric orbit with e=0.385+0.025-0.026 every 10.24368±0.00001
days.
TOI-2328 b is a Saturn-like planet with a mass of 0.16±0.02MJ and
a radius of 0.89+0.04-0.05RJ, orbiting its host star in a nearly
circular orbit with e=0.057+0.046-0.029 at an orbital period of
17.10197±0.00001 days.
All four planets have orbital periods above 10 days, and our planet
interior structure models are consistent with a rocky-icy core with a
H/He envelope, providing evidence supporting the core-accretion model
of planet formation for this kind of planets.
Description:
Stellar radial velocities and activity indices of TOI-6628, TOI-3837,
TOI-5027, and TOI-2328. For each star barycentric Julian dates, radial
velocities, radial velocities errors, bisectors, bisector errors,
H-alpha index, H-alpha index errors, CaII index, CaII index errors,
HeI index, HeI index errors, NaI index, and NaII index errors are
given.
Objects:
-----------------------------------------------------
RA (J2015.5) DE Designation(s)
-----------------------------------------------------
15 03 20.89 -35 13 50.08 TOI-6628 = TIC 75650448
10 10 39.91 +24 16 23.24 TOI-3837 = TIC 308073360
16 15 32.41 -69 13 01.55 TOI-5027 = TIC 361711730
02 06 45.78 -81 14 50.55 TOI-2328 = TIC 394287035
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File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 81 4 List of studied stars
toi6628.dat 107 22 Radial velocities and activity indices of TOI-6628
(table A1)
toi3837.dat 107 15 Radial velocities and activity indices of TOI-3837
(table A2)
toi5027.dat 107 27 Radial velocities and activity indices of TOI-5027
(table A3)
toi2328.dat 107 44 Radial velocities and activity indices of TOI-2328
(table A4)
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See also:
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Name (TOI-NNNN)
10- 11 I2 h RAh Right ascension (ICRS) at Ep=2015.5
13- 14 I2 min RAm Right ascension (ICRS) at Ep=2015.5
16- 20 F5.2 s RAs Right ascension (ICRS) at Ep=2015.5
22 A1 --- DE- Declination sign (ICRS) at Ep=2015.5
23- 24 I2 deg DEd Declination (ICRS) at Ep=2015.5
26- 27 I2 arcmin DEm Declination (ICRS) at Ep=2015.5
29- 33 F5.2 arcsec DEs Declination (ICRS) at Ep=2015.5
35- 40 F6.2 mas/yr pmRA Proper motion along RA
42- 45 F4.2 mas/yr e_pmRA Proper motion along RA error
47- 52 F6.2 mas/yr pmDE Proper motion along DE
54- 57 F4.2 mas/yr e_pmDE Proper motion along DE error
59- 62 F4.2 mas plx Parallax
64- 67 F4.2 mas e_plx Parallax error
69- 71 A3 --- --- [TIC]
73- 81 I9 --- TIC TIC identification number
--------------------------------------------------------------------------------
Byte-by-byte Description of file: toi*.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 F16.8 d BJD Barycentric Julian Date
18- 23 F6.1 m/s RV Radial velocity
26- 29 F4.1 m/s e_RV Radial velocity error
31- 36 F6.3 km/s BIS ?=- Bisector span
38- 42 F5.3 km/s e_BIS ?=- Bisector span error
44- 50 F7.4 --- Halpha ?=- Halpha index
52- 57 F6.4 --- e_Halpha ?=- Halpha index error
59- 66 F8.4 --- CaII ?=- CaII index
68- 73 F6.4 --- e_CaII ?=- CaII index error
75- 80 F6.4 --- HeI ?=- HeI index
82- 87 F6.4 --- e_HeI ?=- HeI index error
89- 94 F6.4 --- NaII ?=- NaII index
96-101 F6.4 --- e_NaII ?=- NaII index error
103-107 A5 --- Inst Instrument name
--------------------------------------------------------------------------------
Acknowledgements:
Marcelo Tala Pinto, marcelo.tala(at)edu.uai.cl
References:
Brahm et al., 2017PASP..129c4002B 2017PASP..129c4002B
CERES: A Set of Automated Routines for Echelle Spectra
(End) Marcelo Tala Pinto [UAI, Chile], Patricia Vannier [CDS] 09-Jan-2025