J/ApJ/772/L2 Keck/HIRES radial velocities for HD 97658 (Dragomir+, 2013)
MOST detects transits of HD 97658b, a warm, likely volatile-rich super-Earth.
Dragomir D., Matthews J.M., Eastman J.D., Cameron C., Howard A.W.,
Guenther D.B., Kuschnig R., Moffat A.F.J., Rowe J.F., Rucinski S.M.,
Sasselov D., Weiss W.W.
<Astrophys. J., 772, L2 (2013)>
=2013ApJ...772L...2D 2013ApJ...772L...2D
ADC_Keywords: Radial velocities ; Stars, double and multiple
Keywords: planets and satellites: formation; planets and satellites: interiors;
stars: individual: HD 97658; techniques: photometric
Abstract:
Through photometric monitoring of the extended transit window of
HD 97658b with the MOST space telescope, we have found that this
exoplanet transits with an ephemeris consistent with that predicted
from radial velocity measurements. The mid-transit times are
5.6σ earlier than those of the unverified transit-like signals
reported in 2011, and we find no connection between the two sets of
events. The transit depth together with our determined stellar radius
(R*=0.703-0.034+0.039R☉) indicates a
2.34-0.150.18R⊕ super-Earth. When combined with the radial
velocity determined mass of 7.86±0.73M⊕, our radius measure
allows us to derive a planet density of 3.44-0.82+0.91g/cm3.
Models suggest that a planet with our measured density has a rocky
core that is enveloped in an atmosphere composed of lighter elements.
The star of the HD 97658 system is the second brightest known to host
a transiting super-Earth, facilitating follow-up studies of this not
easily daunted, warm and likely volatile-rich exoplanet.
Description:
Since the publication of Dragomir et al. (2012, J/ApJ/759/L41), we
have obtained four new Keck HIRES radial velocity measurements. These
were acquired and reduced using the same techniques as in
Howard et al. (2011ApJ...730...10H 2011ApJ...730...10H).
Objects:
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RA (ICRS) DE Designation(s) (Period)
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11 14 33.16 +25 42 37.4 HD 97658 = TYC 1981-1168-1 (P=9.4909)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 27 174 Radial velocities for HD 97658
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See also:
J/ApJ/759/L41 : New radial velocities of HD 97658 (Dragomir+, 2012)
J/ApJ/754/37 : HD 192263 radial velocities and photometry (Dragomir+, 2012)
J/A+A/533/A114 : Transit of super-Earth 55 Cnc e (Demory+, 2011)
J/PASP/123/412 : Exoplanet Orbit Database (Wright+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 F15.6 d BJD Barycentric Julian Date (BJD-2440000)
17- 22 F6.2 m/s RVel [-12.7/12.7] Radial velocity
24- 27 F4.2 m/s e_RVel [0.4/1.7] Uncertainty in RVel
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Feb-2015