J/A+A/681/A55 HD88986 radial velocity curves (Heidari+, 2024)
The SOPHIE search for northern extrasolar planets. XIX. A system including a
cold sub-Neptune potentially transiting a V = 6.5 star HD88986.
Heidari N., Boisse I., Hara N.C., Wilson T.G., Kiefer F., Hebrard G.,
Philipot F., Hoyer S., Stassun K.G., Henry G.W., Santos N.C., Acuna L.,
Almasian D., Arnold L., Astudillo-Defru N., Attia O., Bonfils X., Bouchy F.,
Bourrier V., Collet B., Cortes-Zuleta P., Carmona A., Delfosse X., Dalal S.,
Deleuil M., Demangeon O.D.S., Diaz R.F., Dumusque X., Ehrenreich D.,
Forveille T., Hobson M.J., Jenkins J.S., Jenkins J.M., Lagrange A.M.,
Latham D.W., Larue P., Liu J., Moutou C., Mignon L., Osborn H.P., Pepe F.,
Rapetti D., Rodrigues J., Santerne A., Segransan D., Shporer A., Sulis S.,
Torres G., Udry S., Vakili F., Vanderburg A., Venot O., Vivien H.G.,
Vines J.I.
<Astron. Astrophys. 681, A55 (2024)>
=2024A&A...681A..55H 2024A&A...681A..55H (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities
Keywords: planets and satellites: detection - techniques: photometric -
techniques: radial velocities
Abstract:
Transiting planets with orbital periods longer than 40 d are extremely
rare among the 5000+ planets discovered so far. The lack of
discoveries of this population poses a challenge to research into
planetary demographics, formation, and evolution. Here, we present the
detection and characterization of HD 88986 b, a potentially transiting
sub-Neptune, possessing the longest orbital period among known
transiting small planets (<4R⊕) with a precise mass
measurement (σM/M>25%). Additionally, we identified the
presence of a massive companion in a wider orbit around HD 88986. To
validate this discovery, we used a combination of more than 25 yr of
extensive radial velocity (RV) measurements (441 SOPHIE data points,
31 ELODIE data points, and 34 HIRES data points), Gaia DR3 data, 21 yr
of photometric observations with the automatic photoelectric telescope
(APT), two sectors of TESS data, and a 7-day observation of CHEOPS.
Our analysis reveals that HD 88986 b, based on two potential single
transits on sector 21 and sector 48 which are both consistent with the
predicted transit time from the RV model, is potentially transiting.
The joint analysis of RV and photometric data show that HD 88986 b has
a radius of 2.49±0.18R⊕, a mass of
17.2-3.8+4.0M⊕, and it orbits every 146.05-0.40+0.43d
around a subgiant HD 88986 which is one of the closest and brightest
exoplanet host stars (G2Vtype, R=1.543±0.065R☉,
V=6.47±0.01mag, distance=33.37±0.04pc). The nature of the outer,
massive companion is still to be confirmed; a joint analysis of RVs,
HIPPARCOS, and Gaia astrometric data shows that with a 3σ
confidence interval, its semi-major axis is between 16.7 and 38.8au
and its mass is between 68 and 284MJup. HD 88986 b's wide orbit
suggests the planet did not undergo significant mass loss due to
extreme-ultraviolet radiation from its host star. Therefore, it
probably maintained its primordial composition, allowing us to probe
its formation scenario. Furthermore, the cold nature of HD 88986 b
(460±8K), thanks to its long orbital period, will open up exciting
opportunities for future studies of cold atmosphere composition
characterization. Moreover, the existence of a massive companion
alongside HD 88986 b makes this system an interesting case study for
understanding planetary formation and evolution.
Description:
We present the detection and characterization of HD88986 b, a
potentially transiting sub-Neptune, possessing the longest orbital
period among known transiting small planets (<4R☉) with a
precise mass measurement (sigmaM/M>25%). Additionally, we identified
the presence of a massive companion in a wider orbit around HD88986.
Radial velocities used in the paper.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
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10 16 28.08 +28 40 56.9 HD 88986 = TIC 1042868
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
elodie.dat 71 28 HD88986 ELODIE observations
sophied.dat 89 12 HD88986 SOPHIE DRS 3-1 observations
sophiep.dat 67 378 HD88986 SOPHIE+ observations
hires1.dat 52 17 HD88986 HIRES before CCD change observations
hires2.dat 52 33 HD88986 HIRES after CCD change observations
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See also:
J/A+A/505/853 : HD16760 radial velocity curve (Bouchy+, 2009)
J/A+A/513/A69 : HD9446 radial velocity curve (Hebrard+, 2010)
J/A+A/523/A88 : A Jupiter-mass companion around HD 109246 (Boisse+, 2010)
J/A+A/538/A113 : RV of eight stars (Diaz+ 2012)
J/A+A/545/A55 : RV of 5 stars (Boisse+, 2012)
J/A+A/563/A22 : RV of 3 new hot Jupiters (Moutou+, 2014)
J/A+A/585/A46 : RV of 5 stars (Bouchy+, 2016)
J/A+A/588/A144 : RV of 15 targets (Wilson+, 2016)
J/A+A/588/A145 : RV of 8 stars with giant planets (Hebrard+, 2016)
J/A+A/601/A9 : HD17674, HD29021, and HD42012 radial velocities (Rey+, 2017)
J/A+A/618/A103 : Gl617A and Gl96 radial velocity curves (Hobson+, 2018)
J/A+A/625/A17 : SOPHIE data of Gliese 411 (Diaz+, 2019)
J/A+A/636/L6 : HD 158259 SOPHIE radial velocities (Hara+, 2020)
J/A+A/651/A11 : SOPHIE radial velocities of 27 F/G stars (Dalal+, 2021)
J/A+A/653/A78 : Radial velocity and activity indicators (Demangeon+, 2021)
Byte-by-byte Description of file: elodie.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d RJD Reduced Julian date (JD-2400000)
12- 23 F12.6 m/s RV Radial velocity
25- 33 F9.6 m/s e_RV Radial velocity error
35- 43 F9.6 m/s FWHM Full width at half maximum
45- 53 F9.6 m/s e_FWHM Full width at half maximum error
55- 62 F8.6 --- Cont Contrast
64- 71 F8.6 --- e_Cont Contrast error
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Byte-by-byte Description of file: sophied.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d RJD Reduced Julian date (JD-2400000)
13- 24 F12.6 m/s RV Radial velocity
26- 33 F8.6 m/s e_RV Radial velocity error
35- 42 F8.6 m/s FWHM Full width at half maximum
44- 51 F8.6 m/s e_FWHM Full width at half maximum error
53- 61 F9.6 m/s BIS Bisector span
63- 70 F8.6 m/s e_BIS Bisector span error
72- 80 F9.6 --- RHK RHK activity index
82- 89 F8.6 --- e_RHK RHK activity index error
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Byte-by-byte Description of file: sophiep.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d RJD Reduced Julian date (JD-2400000)
13- 18 F6.3 km/s RV Radial velocity
20- 24 F5.3 km/s e_RV Radial velocity error
26- 32 F7.4 km/s BIS Bisector span
34- 41 F8.4 --- SMW ?=999 Mont-Wilson S index
43- 50 F8.4 --- e_SMW ?=999 Mont-Wilson S index error
52- 59 F8.3 --- Na ?=999 Na index
61- 67 F7.3 --- e_Na ?=999 Na index error
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Byte-by-byte Description of file: hires1.dat hires2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d RJD Reduced Julian date (JD-2400000)
13- 19 F7.3 m/s RV Radial velocity
21- 25 F5.3 m/s e_RV Radial velocity error
27- 32 F6.4 --- SMW Mont-Wilson S index
34- 39 F6.4 --- Ha ? Hα index
41- 46 F6.3 m/s CorV Radial velocity correction value
48- 52 F5.3 m/s e_CorV 1σ uncertainty in CorV
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Acknowledgements:
Neda Heidari, heidari(at)iap.fr
References:
Bouchy et al., Paper I 2009A&A...505..853B 2009A&A...505..853B, Cat. J/A+A/505/853
Hebrard et al., Paper II 2010A&A...513A..69H 2010A&A...513A..69H, Cat. J/A+A/513/A69
Boisse et al., Paper III 2010A&A...523A..88B 2010A&A...523A..88B, Cat. J/A+A/535/A88
Diaz et al., Paper IV 2012A&A...538A.113D 2012A&A...538A.113D, Cat. J/A+A/538/A113
Boisse et al., Paper V 2012A&A...545A..55B 2012A&A...545A..55B, Cat. J/A+A/545/A55
Moutou et al., Paper VI 2014A&A...563A..22M 2014A&A...563A..22M, Cat. J/A+A/563/A22
Courcol et al., Paper VII 2015A&A...581A..38C 2015A&A...581A..38C
Bouchy et al., Paper VIII 2016A&A...585A..46B 2016A&A...585A..46B, Cat. J/A+A/585/A46
Wilson et al., Paper IX 2016A&A...588A.144W 2016A&A...588A.144W, Cat. J/A+A/588/A144
Hebrard et al., Paper X 2016A&A...588A.145H 2016A&A...588A.145H, Cat. J/A+A/588/A145
Diaz et al., Paper XI 2016A&A...591A.146D 2016A&A...591A.146D
Rey et al., Paper XII 2017A&A...601A...9R 2017A&A...601A...9R, Cat. J/A+A/601/A9
Hobson et al., Paper XIII 2018A&A...618A.103H 2018A&A...618A.103H, Cat. J/A+A/618/A03
Diaz et al., Paper XIV 2019A&A...625A..17D 2019A&A...625A..17D, Cat. J/A+A/625/A17
Hobson et al., Paper XV 2019A&A...625A..18H 2019A&A...625A..18H
Hara et al., Paper XVI 2020A&A...636L...6H 2020A&A...636L...6H, Cat. J/A+A/636/L6
Dalal et al., Paper XVII 2021A&A...651A..11D 2021A&A...651A..11D, Cat. J/A+A/651/A11
Demangeon et al., Paper XVIII 2021A&A...653A..78D 2021A&A...653A..78D, Cat. J/A+A/653/A78
(End) Patricia Vannier [CDS] 21-Nov-2023