J/ApJ/761/46 HD 37605 radial velocities and photometry (Wang+, 2012)
The discovery of HD 37605c and a dispositive null detection of transits
of HD 37605b.
Wang S.X., Wright J.T., Cochran W., Kane S.R., Henry G.W., Payne M.J.,
Endl M., Macqueen P.J., Valenti J.A., Antoci V., Dragomir D.,
Matthews J.M., Howard A.W., Marcy G.W., Isaacson H., Ford E.B.,
Mahadevan S., von Braun K.
<Astrophys. J., 761, 46 (2012)>
=2012ApJ...761...46W 2012ApJ...761...46W
ADC_Keywords: Radial velocities ; Stars, double and multiple ; Photometry ;
Planets
Keywords: planetary systems; stars: individual: HD 37605
Abstract:
We report the radial velocity discovery of a second planetary mass
companion to the K0 V star HD 37605, which was already known to host
an eccentric, P∼55 days Jovian planet, HD 37605b. This second planet,
HD 37605c, has a period of ∼7.5 years with a low eccentricity and an
Msini of ∼3.4MJup. Our discovery was made with the nearly 8 years of
radial velocity follow-up at the Hobby-Eberly Telescope and Keck
Observatory, including observations made as part of the Transit
Ephemeris Refinement and Monitoring Survey effort to provide precise
ephemerides to long-period planets for transit follow-up. With a total
of 137 radial velocity observations covering almost 8 years, we
provide a good orbital solution of the HD 37605 system, and a precise
transit ephemeris for HD 37605b. Our dynamic analysis reveals very
minimal planet-planet interaction and an insignificant transit time
variation. Using the predicted ephemeris, we performed a transit
search for HD 37605b with the photometric data taken by the T12 0.8m
Automatic Photoelectric Telescope (APT) and the MOST satellite. Though
the APT photometry did not capture the transit window, it
characterized the stellar activity of HD 37605, which is consistent of
it being an old, inactive star, with a tentative rotation period of
57.67 days. The MOST photometry enabled us to report a dispositive
null detection of a non-grazing transit for this planet. Within the
predicted transit window, we exclude an edge-on predicted depth of
1.9% at the {Gt}10σ level, and exclude any transit with an
impact parameter b>0.951 at greater than 5σ. We present the
BOOTTRAN package for calculating Keplerian orbital parameter
uncertainties via bootstrapping. We made a comparison and found
consistency between our orbital fit parameters calculated by the RVLIN
package and error bars by BOOTTRAN with those produced by a Bayesian
analysis using MCMC.
Description:
Observations on HD 37605 at Hobby-Eberly Telescope (HET) with the High
Resolution Spectrograph (HRS) started 2003 December (R∼60000). In
total, 101 radial velocity observations took place over the course of
almost 8 years.
Observations at Keck were taken starting 2006 August. A set of 33
observations spanning over 5 years were made through the High
Resolution Echelle Spectrometer (HIRES) on the Keck I telescope (R=55000).
The T12 0.8m Automatic Photoelectric Telescope (APT), located at
Fairborn Observatory in southern Arizona, acquired 696 photometric
observations of HD 37605 between 2008 January 16 and 2012 April 7.
We observed HD 37605 during 2011 December 5-6 (around the predicted
Tc (time of conjunction) at BJD 2455901.361) with the MOST satellite
launched in 2003 in the direct imaging mode.
Objects:
--------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period, d)
--------------------------------------------------------------------
05 40 01.73 +06 03 38.1 HD 37605 = TYC 127-402-1
05 40 01.73 +06 03 38.1 HD 37605b = HD 37605b (P=55.01307)
05 40 01.73 +06 03 38.1 HD 37605c = HD 37605c (P=2720)
--------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 29 131 HET and Keck radial velocities for HD 37605
table5.dat 18 696 Photometric observations of HD 37605 from
the T12 0.8m Automatic Photometric Telescope (APT)
table6.dat 29 203 Photometric observations of HD 37605 on MOST
satellite (launched in 2003)
--------------------------------------------------------------------------------
See also:
J/A+A/552/A119 : Planet-star and moon-planet interaction (Saur+, 2013)
J/MNRAS/414/108 : Calibrator of exoplanet-host stars (Beust+, 2011)
J/PASP/123/412 : Exoplanet Orbit Database (Wright+, 2011)
J/AJ/142/176 : Exoplanet host stars. II. Speckle interfero. (Mason+, 2011)
J/AJ/141/11 : Spitzer obs. of planet-host stars (Dodson-Robinson+, 2011)
J/ApJ/733/68 : Exoplanet masses derived from RVs (Brown+, 2011)
J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)
J/ApJ/709/168 : Eccentric orbits in exoplanets (Anglada-Escude+, 2010)
J/MNRAS/403/1368 : vsini for star-planet systems (Gonzalez+, 2010)
J/ApJ/705/1226 : Planet-bearing stars in Spitzer (Bryden+, 2009)
J/ApJ/694/1085 : Radii of exoplanet host stars (van Belle+, 2009)
J/ApJ/666/475 : Extrasolar planet taxonomy (Marchi+, 2007)
J/A+A/475/359 : Predicting radio fluxes of exoplanets (Griessmeier+, 2007)
J/ApJ/649/1010 : Habitability of known exoplanetary systems (Jones+, 2006)
J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.6 d BJD Date of Observation; BJD-2440000
14- 19 F6.1 m/s RVel [-312.6/143.4] Radial Velocity Value
21- 24 F4.1 m/s e_RVel [1/13.1] Error in RVel
26- 29 A4 --- Tel Telescope used (HET or Keck)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d HJD Heliocentric Julian Date; HJD-2400000
12- 18 F7.4 mag dmag [1.44/1.452] Program - Comp differential
magnitude in (b+y)/2 (1)
--------------------------------------------------------------------------------
Note (1): "Program" is HD 37605. "Comp" is the mean of the three comparison
stars HD 39374, HD 38145, and HD 38779.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 F15.10 d HJD Heliocentric Julian Date; HJD-2451545
17- 29 F13.10 mag dmag [-0.008/0.005] Relative magnitude with
respect to standard stars with MOST (350-700nm)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-Aug-2014