J/A+A/688/A216 Four small planets from TESS and ESPRESSO (Hobson+, 2024)
Three super-Earths and a possible water world from TESS and ESPRESSO.
Hobson M.J., Bouchy F., Lavie B., Lovis C., Adibekyan V., Allende Prieto C.,
Alibert Y., Barros S.C.C., Castro-Gonzalez A., Cristiani S., D'Odorico V.,
Damasso M., Di Marcantonio P., Dumusque X., Ehrenreich D., Figueira P.,
Genova Santos R., Gilbert E.A., Gonzalez Hernandez J.I., Lillo-Box J.,
Lo Curto G., Martins C.J.A.P., Mehner A., Micela G., Molaro P., Nunes N.J.,
Palle E., Pepe F., Rebolo R., Rodrigues J., Santos N., Sousa S.G.,
Sozzetti A., Suarez Mascareno A., Tabernero H.M., Udry S.,
Zapatero Osorio M.-R., Armstrong D.J., Ciardi D.R., Collins K.A.,
Collins K.I., Everett M., Gandolfi D., Howell S.B., Jenkins J.M.,
Kielkopf J., Livingston J.H., Lund M.B., Mireles I., Ricker G.R.,
Schwarz R.P., Seager S., Tan T.-G., Ting E.B., Winn J.N.
<Astron. Astrophys. 688, A216 (2024)>
=2024A&A...688A.216H 2024A&A...688A.216H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities ;
Optical ; Spectroscopy
Keywords: planets and satellites: individual: TOI-260 -
planets and satellites: individual: TOI-286 -
planets and satellites: individual: TOI-134
Abstract:
Since 2018, the ESPRESSO spectrograph at the VLT has been hunting for
planets in the southern skies via the radial velocity (RV) method. One
of its goals is to follow up on candidate planets from transit surveys
such as the TESS mission, with a particular focus on small planets for
which ESPRESSO's RV precision is vital.
We aim to confirm and characterise, in detail, three super-Earth
candidate transiting planets from TESS using precise RVs from
ESPRESSO.
We analysed photometry from TESS and ground-based facilities,
high-resolution imaging, and RVs from ESPRESSO, HARPS, and HIRES, to
confirm and characterise three new planets: TOI-260 b, transiting a
late K dwarf, and TOI-286 b and c, orbiting an early K dwarf. We also
updated the parameters for the known super-Earth TOI-134 b
(L 168-9 b), which is hosted by an M dwarf.
TOI-260 b has a 13.475853+0.000013-0.000011d period,
4.23±1.60M⊕ mass, and 1.71±0.08R⊕ radius. For
TOI-286 b we find a 4.5117244+0.0000031-0.0000027d period,
4.53±0.78M⊕ mass, and 1.42±0.10R⊕ radius; for
TOI-286 c, we find a 39.361826+0.000070-0.000081d period,
3.72±2.22M⊕ mass, and 1.88±0.12R⊕ radius. For
TOI-134 b we obtain a 1.40152604+0.00000074-0.00000082d period,
4.07±0.45M⊕ mass, and 1.63±0.14R⊕ radius. Circular
models are preferred for all the planets, although for TOI-260 b the
eccentricity is not well constrained. We computed bulk densities and
placed the planets in the context of composition models.
TOI-260 b lies within the radius valley, and is most likely a rocky
planet. However, the uncertainty on the eccentricity and thus on the
mass renders its composition hard to determine. TOI-286 b and c span
the radius valley, with TOI-286 b lying below it and having a likely
rocky composition, while TOI-286 c is within the valley, close to the
upper border, and probably has a significant water fraction. With our
updated parameters for TOI-134 b, we obtain a lower density than
previous findings, giving a rocky or Earth-like composition.
Description:
Radial velocities and activity indices from ESPRESSO and HARPS for
TOI-260, TOI-286 and TOI-134.
Objects:
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RA (2000) DE Designation(s)
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00 19 05.56 -09 57 53.4 TOI-260 = TIC 37749396
06 03 56.06 -60 39 58.7 TOI-286 = TIC 150030205
23 20 07.52 -60 03 54.6 TOI-134 = TIC 234994474
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
toi134e.dat 153 48 ESPRESSO radial velocities for TOI-134
toi260e.dat 153 45 ESPRESSO radial velocities for TOI-260
toi260h.dat 72 6 HARPS-TERRA radial velocities for TOI-260
toi286e.dat 152 47 ESPRESSO radial velocities for TOI-286
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See also:
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
Byte-by-byte Description of file: toi134e.dat toi260e.dat toi286e.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 d BJD Baricentric Julian date (BJD-2457000)
11- 19 F9.2 m/s RV Radial velocity
21- 26 F6.2 m/s e_RV Radial velocity error
28- 34 F7.2 --- Bis CCF Bisector
36- 41 F6.2 --- e_Bis CCF Bisector error
43- 49 F7.2 --- FWHM CCF full width at half maximum
51- 56 F6.2 --- e_FWHM CCF full width at half maximum error
58- 66 F9.4 --- Contrast CCF Contrast
68- 76 F9.4 --- e_Contrast CCF Contrast error
78- 85 F8.6 --- Halpha Halpha activity indicator
87- 94 F8.6 --- e_Halpha Halpha activity indicator error
96-102 F7.5 --- SMW S Mount Wilson activity indicator
104-110 F7.5 --- e_SMW S Mount Wilson activity indicator error
112-119 F8.5 --- log(R'HK) log(R'HK) activity indicator
121-127 F7.5 --- e_log(R'HK) log(R'HK) activity indicator error
129-136 F8.6 --- NaI ?=99 NaI doublet activity indicator
138-145 F8.6 --- e_NaI ?=9 NaI doublet activity indicator error
147-153 A7 --- Dataset ESPRESSO dataset identifier (1)
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Note (1): ESPR18 and ESPR19 refer to observations taken before and after the
instrument upgrade in 2019, respectively.
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Byte-by-byte Description of file: toi260h.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 d BJD Baricentric Julian date (BJD-2457000)
11- 18 F8.5 km/s RV Relative radial velocity (1)
20- 26 F7.5 km/s e_RV Relative radial velocity error
28- 32 F5.3 --- Bis CCF Bisector
34- 38 F5.3 --- FWHM CCF full width at half maximum
40- 44 F5.2 --- Contrast CCF Contrast
46- 51 F6.4 --- Halpha Halpha activity indicator
53- 58 F6.4 --- SMW S Mount Wilson activity indicator
60- 65 F6.4 --- NaD1 NaI D1 activity indicator
67- 72 F6.4 --- NaD2 NaI D2 activity indicator
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Note (1): HARPS-TERRA RVs are relative. The measurement with an RV value of 0,
corresponding to BJD-2457000 = 1508.6066, is the zero-point RV.
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Acknowledgements:
Melissa Hobson, Melissa.Hobson(at)unige.ch
(End) Patricia Vannier [CDS] 14-Jun-2024