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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
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:
    ------------------------------------------------------------------
       RA   (2000)   DE        Designation(s)             (Per)
    ------------------------------------------------------------------
    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)
    ------------------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

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)


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

   Bytes Format Units   Label     Explanations

   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)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   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)


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."--------------------------------------------------------------------------------

History:


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    26-Jul-2012