J/ApJ/675/1531 Transits of super-Neptune HD 149026b (Winn+, 2008)
Five new transits of the super-Neptune HD 149026b.
Winn J.N., Henry G.W., Torres G., Holman M.J.
<Astrophys. J., 675, 1531-1537 (2008)>
=2008ApJ...675.1531W 2008ApJ...675.1531W
ADC_Keywords: Stars, double and multiple ; Planets
Keywords: planetary systems - stars: individual (HD 149026)
Abstract:
We present new photometry of HD 149026 spanning five transits of its
"super-Neptune" planet. In combination with previous data, we improve
on the determination of the planet-to-star radius ratio:
Rp/R*=0.0491+0.0018-0.0005. We find the planetary radius to be
0.71±0.05R{Jup}, in accordance with previous theoretical models
invoking a high metal abundance for the planet. The limiting error is
the uncertainty in the stellar radius. Although we find agreement
among four different ways of estimating the stellar radius, the
uncertainty remains at 7%. We also present a refined transit ephemeris
and a constraint on the orbital eccentricity and argument of
pericenter, ecosω=-0.0014±0.0012 , based on the measured
interval between primary and secondary transits.
Description:
We used three of the 0.8m automated photometric telescopes (APTs) at
Fairborn Observatory to measure the transits of HD 149026b that
occurred on UT 2006 April 26, 2006 May 20, 2007 May 3, 2007 June 18,
and 2007 June 21.
Objects:
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RA (2000) DE Designation(s)
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16 30 29.6 +38 20 50 HD 149026 = HIP 80838
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 29 2219 Photometry of HD 149026
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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 at mid-exposure
15- 21 F7.5 --- RFlux Relative flux (1)
23- 29 F7.5 --- e_RFlux Uncertainty in RFlux (2)
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Note (1): The data were obtained with the automatic photometric telescopes
(APTs) at Fairborn Observatory. Differential magnitudes were measured
in the Stromgren b and y passbands, and the b and y results were
averaged.
Note (2): Uncertainties include the "red noise" correction described in
Section 3.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 25-Jul-2010