J/ApJ/832/131 HD 88133 11-yrs radial velocity measurements (Piskorz+, 2016)
Evidence for the direct detection of the thermal spectrum of the non-transiting
hot gas giant HD 88133 b.
Piskorz D., Benneke B., Crockett N.R., Lockwood A.C., Blake G.A.,
Barman T.S., Bender C.F., Bryan M.L., Carr J.S., Fischer D.A., Howard A.W.,
Isaacson H., Johnson J.A.
<Astrophys. J., 832, 131-131 (2016)>
=2016ApJ...832..131P 2016ApJ...832..131P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Radial velocities ; Spectra, infrared
Keywords: planets and satellites: atmospheres; techniques: spectroscopic
Abstract:
We target the thermal emission spectrum of the non-transiting gas
giant HD 88133 b with high-resolution near-infrared spectroscopy, by
treating the planet and its host star as a spectroscopic binary. For
sufficiently deep summed flux observations of the star and planet
across multiple epochs, it is possible to resolve the signal of the
hot gas giant's atmosphere compared to the brighter stellar spectrum,
at a level consistent with the aggregate shot noise of the full data
set. To do this, we first perform a principal component analysis to
remove the contribution of the Earth's atmosphere to the observed
spectra. Then, we use a cross-correlation analysis to tease out the
spectra of the host star and HD 88133 b to determine its orbit and
identify key sources of atmospheric opacity. In total, six epochs of
Keck NIRSPEC L-band observations and three epochs of Keck NIRSPEC
K-band observations of the HD 88133 system were obtained. Based on an
analysis of the maximum likelihood curves calculated from the
multi-epoch cross-correlation of the full data set with two
atmospheric models, we report the direct detection of the emission
spectrum of the non-transiting exoplanet HD 88133 b and measure a
radial projection of the Keplerian orbital velocity of 40±15km/s, a
true mass of 1.02-0.28+0.61MJ, a nearly face-on orbital
inclination of 15-5+6°, and an atmosphere opacity structure at
high dispersion dominated by water vapor. This, combined with 11 years
of radial velocity measurements of the system, provides the most
up-to-date ephemeris for HD 88133.
Description:
The radial velocity (RV) measurements of HD 88133 have been made under
the purview of the California Planet Survey (CPS; Howard+
2010ApJ...721.1467H 2010ApJ...721.1467H) with the HIRES at the W.M. Keck Observatory.
Seventeen RV measurements of HD 88133 were published in an earlier
study (Fischer+ 2005ApJ...620..481F 2005ApJ...620..481F), and here we extend that data set
to 55 individual RV measurements, having a baseline of 11 years (see
Table 1).
Multi-epoch observation data were taken on six nights (2012 April 1
and 3, 2013 March 10 and 29, 2014 May 14, 2015 April 8) in the L band
and three nights (2015 November 21, 2015 December 1, and 2016 April
15) in the K band with the NIRSPEC instrument at the W.M. Keck
Observatory.
Objects:
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RA (ICRS) DE Designation(s) (Period)
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10 10 07.68 +18 11 12.7 HD 88133 = TYC 1422-1130-1 (P=3.414867)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 24 55 HD 88133 radial velocity measurements
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See also:
III/144 : Radial Velocities for High Proper Motion Stars (Fouts+, 1986)
J/A+A/585/A73 : PTPS stars. III. The evolved stars sample (Niedzielski+, 2016)
J/ApJ/821/89 : 12yrs of RV obs. of exoplanet systems (Bryan+, 2016)
J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)
J/A+A/574/A50 : Chemical abundances of giants and subgiants (Jofre+, 2015)
J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)
J/A+A/576/A134 : Radial velocities of 51 Peg (Martins+, 2015)
J/A+A/557/A70 : Evolved planet hosts - stellar parameters (Mortier+, 2013)
J/A+A/546/A61 : Radial velocities for XHIP catalogue (de Bruijne+, 2012)
J/ApJ/733/68 : Exoplanet masses derived from RVs (Brown+, 2011)
J/ApJ/715/458 : Differential photometry of HAT-P-14 (Torres+, 2010)
J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)
J/AJ/131/2274 : TrES-1 equivalent widths (Sozzetti+, 2006)
J/ApJS/152/261 : Chromospheric Ca II emission in nearby stars (Wright+, 2004)
J/AJ/117/981 : Estimation of stellar metal abundance. II. (Beers+, 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 --- BJD Barycentric Julian Date; BJD-2440000
14- 19 F6.2 m/s HRV [-37/39] Heliocentric Radial velocity
21- 24 F4.2 m/s e_HRV [0.9/3] Uncertainty in RVel
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Feb-2017