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J/ApJ/689/L149  Parameter variations of Gliese 436b transits   (Coughlin+, 2008)

New observations and a possible detection of parameter variations in the transits of Gliese 436b. Coughlin J.L., Stringfellow G.S., Becker A.C., Lopez-Morales M., Mezzalira F., Krajci T. <Astrophys. J., 689, L149-L152 (2008)> =2008ApJ...689L.149C
ADC_Keywords: Planets ; Stars, diameters ; Stars, variable Keywords: planetary systems - stars: individual (Gliese 436) Abstract: We present ground-based observations of the transiting Neptune-mass planet Gl 436b obtained with the 3.5m telescope at Apache Point Observatory and other supporting telescopes. Included in this is an observed transit in early 2005, over 2 years before the earliest reported transit detection. We have compiled all available transit data to date and perform a uniform modeling using the JKTEBOP code. We do not detect any transit timing variations of amplitude greater than ∼1 minute over the ∼3.3 year baseline. We do however find possible evidence for a self-consistent trend of increasing orbital inclination, transit width, and transit depth, which supports the supposition that Gl 436b is being perturbed by another planet of ≲12M{earth} in a nonresonant orbit. Description: We observed Gl 436 (J114211+264224) in the V filter on the nights of 2008 April 7, April 28, and May 6 UT with the 3.5m telescope at Apache Point Observatory (APO). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 11 42 11.1 +26 42 24 Gliese 436b = GJ 436 b ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 125 58 Parameters derived from using the JKTEBOP code with 1σ errors
See also: J/A+A/471/L51 : Spitzer observations of the hot Neptune GJ 436b (Gillon+, 2007) J/A+A/475/1125 : Characterization of the hot Neptune GJ 436b (Demory+, 2007) J/A+A/507/481 : GJ 436b and XO-1b transits (Caceres+, 2009) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 A1 --- Mod Model type (1) 3- 6 I4 --- E ? Epoch of observation (2) 8- 25 A18 --- Source Source of Data (telescope or author) 27- 45 A19 --- BibCode Bibcode of author if relevent 47 A1 --- f_Source [ab] Precision on source (3) 49- 52 A4 --- Filt Filter (8um, B, H, I, R, V, None); Johnson-Cousins system 54- 63 F10.5 d t0 ? HJD-2450000 (Heliocentric Julian Date) of minimum 65- 71 F7.5 d e_t0 ? 1σ uncertainty in Tmin 73- 77 F5.2 deg i Orbital inclination 79- 82 F4.2 deg e_i 1σ uncertainty in i 84- 88 F5.3 Rsun R* Stellar radius (in solar radius) 90- 94 F5.3 Rsun e_R* 1σ uncertainty in R* 96- 99 F4.2 --- Rp Planetary radius in Earth radii (6371km) 101-104 F4.2 --- e_Rp 1σ uncertainty in Rp 106-110 F5.2 mmag Depth Depth of eclipse 112-115 F4.2 mmag e_Depth 1σ uncertainty in Depth 117-120 F4.1 min Width Width of eclipse 122-125 F4.1 min e_Width 1σ uncertainty in Width
Note (1): Model type as follows: V = Ratio of radii k=Rp/Rs allowed to vary. F = Star and Planet radii fixed by fixing k. Note (2): Epoch with E=0 the initial transit discovery of Gillon et al. (2007A&A...472L..13G). Note (3): Data source as follows: a = Amateur Observer with data obtained from Bruce Gary. http://brucegary.net/AXA/GJ436/gj436.htm. b = Data were digitized from published plot.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 20-Jan-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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