J/AJ/141/63 Relative radial velocities of HAT-P-4 and HAT-P-14 (Winn+, 2011)
Orbital orientations of exoplanets:
HAT-P-4b is prograde and HAT-P-14b is retrograde.
Winn J.N., Howard A.W., Johnson J.A., Marcy G.W., Isaacson H., Shporer A.,
Bakos G.A., Hartman J.D., Holman M.J., Albrecht S., Crepp J.R., Morton T.D.
<Astron. J., 141, 63 (2011)>
=2011AJ....141...63W 2011AJ....141...63W
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: planetary systems - planets and satellites: formation -
planet-star interactions - stars: rotation
Abstract:
We present observations of the Rossiter-McLaughlin effect for two
exoplanetary systems, revealing the orientations of their orbits
relative to the rotation axes of their parent stars. HAT-P-4b is
prograde, with a sky-projected spin-orbit angle of
λ=-4.9±11.9°. In contrast, HAT-P-14b is retrograde, with
λ=189.1±5.1°. These results conform with a previously
noted pattern among the stellar hosts of close-in giant planets:
hotter stars have a wide range of obliquities and cooler stars have
low obliquities. This, in turn, suggests that three-body dynamics and
tidal dissipation are responsible for the short-period orbits of many
exoplanets. In addition, our data revealed a third body in the HAT-P-4
system, which could be a second planet or a companion star.
Description:
Our spectroscopic observations employed the High Resolution
Spectrograph (HIRES) of the Keck I 10m telescope, on Mauna Kea,
Hawaii. We gathered 35 spectra of HAT-P-4 on the night of 2010 March
29/30, and 44 spectra of HAT-P-14 on the night of 2010 April 27/28, in
both cases spanning a predicted transit of the planet. An additional
14 spectra of HAT-P-4 were gathered on other nights, at essentially
random orbital phases.
Objects:
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RA (2000) DE Designation(s) (Per)
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15 19 57.93 +36 13 46.8 HAT-P-4 = BD+36 2593 (P=3.0565195)
17 20 27.87 +38 14 31.9 HAT-P-14 = TYC 3086-152-1 (P=4.6276690)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 26 58 Relative radial velocity measurements of
HAT-P-14 (P=4.6276690±0.0000050)
table2.dat 26 59 Relative radial velocity measurements of
HAT-P-4 (P=3.0565195±0.0000025)
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See also:
J/A+A/527/A85 : Light curves of HAT-P-3b and HAT-P-14b (Nascimbeni+, 2011)
J/ApJ/715/458 : Differential photometry of HAT-P-14 (Torres+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date; UTC
15- 21 F7.2 m/s RV Relative radial Velocity (G1)
23- 26 F4.2 m/s e_RV Uncertainty in RV (G2)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date; UTC
15- 21 F7.2 m/s RV Relative radial Velocity (G1)
23- 26 F4.2 m/s e_RV Uncertainty in RV (G2)
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Global notes:
Note (G1): The RV was measured relative to an arbitrary template spectrum;
only the differences are significant.
Note (G2): internal error only and does not account for any possible
"stellar jitter."
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 26-Jul-2012