J/ApJ/741/102 21 light curves of OGLE-TR-56b (Adams+, 2011)
Twenty-one new light curves of OGLE-TR-56b: new system parameters and limits on
timing variations.
Adams E.R., Lopez-Morales M., Elliot J.L., Seager S., Osip D.J.,
Holman M.J., Winn J.N., Hoyer S., Rojo P.
<Astrophys. J., 741, 102 (2011)>
=2011ApJ...741..102A 2011ApJ...741..102A
ADC_Keywords: Photometry ; Planets
Keywords: planetary systems - stars: individual (OGLE-TR-56)
Abstract:
Although OGLE-TR-56b was the second transiting exoplanet discovered,
only one light curve, observed in 2006, has been published besides the
discovery data. We present 21 light curves of 19 different transits
observed between 2003 July and 2009 July with the Magellan Telescopes
and Gemini South. The combined analysis of the new light curves
confirms a slightly inflated planetary radius relative to model
predictions, with Rp=1.378±0.090RJ. However, the values found
for the transit duration, semimajor axis, and inclination values
differ significantly from the previous result, likely due to
systematic errors. The new semimajor axis and inclination,
a=0.01942±0.00015AU and i=73.72±0.18°, are smaller than
previously reported, while the total duration, T14=7931±38s, is 18
minutes longer. The transit midtimes have errors from 23s to several
minutes, and no evidence is seen for transit midtime or duration
variations. Similarly, no change is seen in the orbital period,
implying a nominal stellar tidal decay factor of Q*=107, with a
3σ lower limit of 105.7.
Description:
Nineteen transits were observed between 2003 July and 2009 July, all
but one with the Magellan telescopes. All transits are referred to by
the UTC date of observations; when multiple light curves exist for a
given UTC date, e.g., the two light curves on 2005 April 19 UT in the
Johnson B and I bands, they are denoted respectively as 20050419B and
20050419I. Seven full or partial transits were observed by the Transit
Light Curve (TLC) collaboration using the Magellan Instant Camera
(MagIC) with the original SITe CCD. Thirteen transits were observed
between 2006 and 2009 on Magellan using three instruments: the
Portable Occultation, Eclipse, and Transit System (POETS, three
transits); Inamori Magellan Areal Camera and Spectrograph (IMACS; one
transit), and MagIC (e2v CCD, nine transits). One additional transit
was observed in 2009 using Gemini Multi-Object Spectrograph (GMOS) on
Gemini South.
Objects:
------------------------------------------------------------------------
RA (2000) DE Designation(s) (Period)
------------------------------------------------------------------------
17 56 35.51 -29 32 21.2 OGLE-TR-56b = NAME OGLE-TR-56b (P=1.211911)
------------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 85 21 Observational details for 21 new light curves
of OGLE-TR-56b
table3.dat 77 18897 Flux values for new transits of OGLE-TR-56b
--------------------------------------------------------------------------------
See also:
II/278 : Transits observed in OGLE 2001-2003 (Udalski+, 2002-2004)
J/ApJ/582/1123 : Search for transiting exoplanets (Mallen-Ornelas+, 2003)
J/ApJ/612/511 : Exoplanet radio emission (Lazio+, 2004)
J/A+A/458/997 : Abundances for 6 transiting planet host stars (Santos+, 2006)
J/ApJ/649/1010 : Habitability of known exoplanetary systems (Jones+, 2006)
J/A+A/475/359 : Predicting radio fluxes of exoplanets (Griessmeier+, 2007)
J/ApJ/692/L9 : Tidal evolution of transiting exoplanets (Levrard+, 2009)
J/ApJ/716/1336 : Stability analysis of single-planet (Kopparapu+, 2010)
J/MNRAS/411/L46 : Exoplanet magnetic fields (Vidotto+, 2011)
J/MNRAS/422/2024 : X-ray-age relation & exoplanet evaporation (Jackson+, 2012)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- TrID Transit identifier (G1)
11- 20 A10 --- Inst Instrument (GMOS, IMACS, MagIC-SITe, MagIC-e2v,
POETS)
22- 25 I4 --- Nfr [47/6642] Number of frames used
27- 30 I4 --- N(fr) [0/1379] Number of additional frames that were
discarded
31 A1 --- f_N(fr) [b-i] Flag on N(fr) (1)
33- 37 A5 s Exp Exposure time(s)
39- 42 A4 --- Filt Filter: B, I, Is,WB (630-950nm), i", r", z"
or None
43 A1 --- f_Filt [g] g = WB6300-9500, a wideband filter from 630
to 950nm
45- 47 A3 --- Bin Binning (1x1 or 2x2)
48 A1 --- n_ro [c] c = Readout is a few milliseconds in
frame-transfer mode
50- 51 I2 s ro [5/25]? Readout time
53- 59 A7 --- Airmass Airmass range
61- 63 F3.1 h Hobs [2.4/7.9] Time observed in hr
65- 67 I3 min Mobs +Time observed (before Ingress) in minutes
69- 76 A8 --- Atm Atmophere stability:
Stable, Superb or Variable
78- 85 A8 arcsec Seeing Seeing range
--------------------------------------------------------------------------------
Note (1): Flag as follows:
b = Discarded during meridian crossing (images elongated).
d = Discarded baseline after transit at a different pointing, which did not
return to the same ratio level as before.
e = Discarded 31 frames during meridian crossing, 1347 frames at airmass >1.1,
and 1 frame with an aberrant ratio.
f = Discarded a few anomalous frames, e.g., due to a seeing spike on one or
more frames.
h = Discarded initial frames with low counts on target (50 points) and a minor
seeing spike (14 points).
i = Discarded frames with large target diameters (poor seeing): >11.5 pixels
(20080727) and >11.0 pixels (20090504).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- --- [OGLE56-]
8- 13 A6 --- Inst Instrument: GMOS, IMACS, POETS, Pont07, TLC
or e2v
14 A1 --- --- [-]
15-23 A9 --- TrID Transit identifier (YYYYMMDDA) (1)
25- 38 F14.6 d midJD ? Mid-exposure Julian date
40- 57 F18.10 d midBJD [2452850/2455041] Mid-exposure Barycentric
Julian date
59- 67 F9.7 --- Flux [0.9638/1.0301] Relative flux
69- 77 F9.7 --- e_Flux [0.0006/0.0025] Error in Flux
--------------------------------------------------------------------------------
Note (1): In 2006 June and July, POETS was installed as a visiting PI instrument
on the Clay telescope. For the first two transits observed, a Schuler
Astrodon Johnson-Cousins Is filter was used. For the third transit,
observed on 2006 July 20, coincidentally the same night as the transit
by Pont et al. (2007A&A...465.1069P 2007A&A...465.1069P), no filter was used as a test to
achieve greater throughput. We refer to this as 20060720N to
distinguish it from the Pont et al. observations. See section 2 for
further explanations about observations.
--------------------------------------------------------------------------------
Global Notes:
Note (G1): the transdit identifier TrID is made from the UT date of
the observation (YYYYMMDD), eventually followed by a letter
representing the filter in case of several observations in a day.
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-Feb-2013