J/A+A/635/A122 CoRoT-30b and CoRoT-31b radial velocity curves (Border+, 2020)
Transiting exoplanets from the CoRoT space mission.
XXIX. The hot Jupiters CoRoT-30 b and CoRoT-31 b.
Borde P., Diaz R.F., Creevey O., Damiani C., Deeg H., Klagyivik P.,
Wuchterl G., Gandolfi D., Fridlund M., Bouchy F., Aigrain S., Alonso R.,
Almenara J.-M., Baglin A, Barros S.C.C., Bonomo A.S., Cabrera J.,
Csizmadia Sz., Deleuil M., Erikson A., Ferraz-Mello S., Guenther E.W.,
Guillot T., Grziwa S., Hatzes A., Hebrard G., Mazeh T., Ollivier M.,
Parviainen H., Paetzold M., Rauer H., Rouan D., Santerne A., Schneider J.
<Astron. Astrophys. 635, A122 (2020)>
=2020A&A...635A.122B 2020A&A...635A.122B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities
Keywords: planetary systems - stars: fundamental parameters -
stars: individual: CoRoT-30 - stars: individual: CoRoT-31
Abstract:
We report the discovery as well as the orbital and physical
characterizations of two new transiting giant exoplanets, CoRoT-30 b
and CoRoT-31 b, with the CoRoT space telescope.
We analyzed two complementary data sets: photometric transit light
curves measured by CoRoT, and radial velocity curves measured by the
HARPS spectrometer. To derive the absolute masses and radii of the
planets, we modeled the stars from available magnitudes and spectra.
We find that CoRoT-30 b is a warm Jupiter on a close-to-circular
9.06-day orbit around a G3V star with a semi-major axis of about
0.08AU. It has a radius of 1.01±0.08RJup, a mass of
2.90±0.22MJup, and therefore a mean density of 3.45±0.65g/cm3.
The hot Jupiter CoRoT-31 b is on a close to circular 4.63-day orbit
around a G2 IV star with a semi-major axis of about 0.05AU. It has a
radius of 1.46±0.30RJup, a mass of 0.84±0.34MJup, and
therefore a mean density of 0.33±0.18g/cm3.
Neither system seems to support the claim that stars hosting planets
are more depleted in lithium. The radii of both planets are close to
that of Jupiter, but they differ in mass; CoRoT-30 b is ten times
denser than CoRoT-31 b. The core of CoRoT-30 b would weigh between 15
and 75 Earth masses, whereas relatively weak constraints favor no core
for CoRoT-31 b. In terms of evolution, the characteristics of CoRoT-31
b appear to be compatible with the high-eccentricity migration
scenario, which is not the case for CoRoT-30 b. The angular momentum
of CoRoT-31 b is currently too low for the planet to evolve toward
synchronization of its orbital revolution with stellar rotation, and
the planet will slowly spiral-in while its host star becomes a red
giant. CoRoT-30 b is not synchronized either: it looses angular
momentum owing to stellar winds and is expected reach steady state in
about 2Gyr. CoRoT-30 and 31, as a pair, are a truly remarkable
example of diversity in systems with hot Jupiters.
Description:
Radial velocity measurements of CoRoT-30 and CoRoT-31 were obtained
with the HARPS spectrograph. HARPS is a cross-dispersed echelle
spectrograph fiber-fed from the Cassegrain focus of the 3.6m telescope
at La Silla Observatory, Chile. We obtained 18 and 17 spectra of
CoRoT-30 and CoRoT-31, respectively, with exposure times ranging
between 3300s and 3600s. We used the high-accuracy mode (HAM), with
spectral resolution R∼115000. For the observation of these faint
targets, one of the two available fibers was set on the sky in order
to monitor the moonlight and to obtain the best-fit sky background
subtraction. The S/N per pixel at 550 nm ranges from 2.2 to 6.8 for
CoRoT-30 and from 3.2 to 6.8 for CoRoT-31, which translates into
photon noise uncertainties of about 30-40m/s.
Objects:
---------------------------------------------------------
RA (2000) DE Designation(s)
---------------------------------------------------------
18 30 24.264 +06 50 09.424 CoRoT-30 = CoRoT 631418634
06 19 16.975 -04 25 20.194 CoRoT-31 = CoRoT 600574166
---------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 26 18 Radial velocity measurements on CoRoT-30
obtained by HARPS
table3.dat 28 17 Radial velocity measurements on CoRoT-31
obtained by HARPS
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See also:
B/corot : CoRoT observation log (N2-4.4) (CoRoT 2016)
J/A+A/520/A66 : CoRoT-8b light and RV curves (Borde+, 2010)
Byte-by-byte Description of file: table2.dat table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.6 d BJD Barycentric Julian Date (BJD-2400000)
14- 20 F7.3 km/s RV Radial Velocity
22- 26 F5.3 km/s e_RV Uncertainty in RV (1-sigma)
28 I1 --- Moon [0/1]? Moon contamination (Boolean)
(only in table3)
--------------------------------------------------------------------------------
Acknowledgements:
Pascal Borde, pascal.borde(at)u-bordeaux.fr
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(End) Patricia Vannier [CDS] 30-Dec-2019