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J/AJ/153/191        Transiting planet GJ 1132                (Southworth+, 2017)

Detection of the atmosphere of the 1.6 M exoplanet GJ 1132 b. Southworth J., Mancini L., Madhusudhan N., Molliere P., Ciceri S., Henning T. <Astron. J., 153, 191-191 (2017)> =2017AJ....153..191S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Exoplanets Photometry, SDSS ; Photometry, infrared Keywords: planetary systems - stars: fundamental parameters - stars: individual: GJ 1132 Abstract: Detecting the atmospheres of low-mass, low-temperature exoplanets is a high-priority goal on the path to ultimately detecting biosignatures in the atmospheres of habitable exoplanets. High-precision HST observations of several super-Earths with equilibrium temperatures below 1000K have to date all resulted in featureless transmission spectra, which have been suggested to be due to high-altitude clouds. We report the detection of an atmospheric feature in the atmosphere of a 1.6M exoplanet, GJ 1132 b, with an equilibrium temperature of ∼600K and orbiting a nearby M dwarf. We present observations of nine transits of the planet obtained simultaneously in the griz and JHK passbands. We find an average radius of 1.43±0.16R for the planet, averaged over all the passbands, and a radius of 0.255±0.023R for the star, both of which are significantly greater than previously found. The planet radius can be decomposed into a "surface radius" at ∼1.375R overlaid by atmospheric features that increase the observed radius in the z and K bands. The z-band radius is 4σ higher than the continuum, suggesting a strong detection of an atmosphere. We deploy a suite of tests to verify the reliability of the transmission spectrum, which are greatly helped by the existence of repeat observations. The large z-band transit depth indicates strong opacity from H2O and/or CH4 or a hitherto-unconsidered opacity. A surface radius of 1.375±0.16R allows for a wide range of interior compositions ranging from a nearly Earth-like rocky interior, with ∼70% silicate and ∼30% Fe, to a substantially H2O-rich water world. Description: Light curves of 10 transits of the extrasolar planetary system GJ 1132 are presented. The data were obtained using the MPG 2.2m telescope with GROND imager, and observed simultaneously in the g, r, i, z, J, H and K passbands. The errorbars for each transit have been scaled so the best-fitting model (obtained using the JKTEBOP code) has a reduced chi-squared value of 1.0. Objects: ------------------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------------------- 10 14 51.89 -47 09 24.6 GJ 1132 = 2MASS J10145184-4709244 ------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file gj1132.dat 37 7122 Photometry of GJ 1132
See also: J/MNRAS/396/1023 : Transiting planetary system WASP-5 (Southworth+, 2009) J/MNRAS/399/287 : Transiting planetary system WASP-4 (Southworth+, 2009) J/ApJ/707/167 : Transiting planetary system WASP-18 (Southworth+, 2009) J/MNRAS/408/1680 : Transiting planetary system WASP-2 (Southworth+, 2010) J/A+A/527/A8 : Transiting planetary system WASP-7 (Southworth+, 2011) J/MNRAS/420/2580 : Four transits of HAT-P-13 (Southworth+, 2012) J/MNRAS/422/3099 : Transits of HAT-P-5 (Southworth+, 2012) J/MNRAS/426/1338 : Transiting planetary system WASP-17 (Southworth+, 2012) J/MNRAS/434/1300 : Planetary systems WASP-15, WASP-16 (Southworth+, 2013) J/MNRAS/444/776 : WASP-24, WASP-25 and WASP-26 (Southworth+, 2014) J/MNRAS/447/711 : Transiting planetary system WASP-103 (Southworth+, 2015) J/MNRAS/454/3094 : Transiting planetary system WASP-57 (Southworth+, 2016) Byte-by-byte Description of file: gj1132.dat
Bytes Format Units Label Explanations
1 A1 --- Filt [grizJHK] Filter used for the observation 3- 16 F14.6 d BJD Barycentric JD for the midpoint of observation (TDB) 18- 27 F10.7 mag dmag Differential magnitude in that filter 29- 37 F9.7 mag e_dmag Measurement error of the differential magnitude
Acknowledgements: John Southworth, astro.js(at)keele.ac.uk References: Southworth et al., Paper I 2009MNRAS.396.1023S, Cat. J/MNRAS/396/1023 Southworth et al., Paper II 2009MNRAS.399..287S, Cat. J/MNRAS/399/287 Southworth et al., Paper III 2010MNRAS.408.1680S, Cat. J/MNRAS/408/1680 Southworth et al., Paper IV 2012MNRAS.426.1338S, Cat. J/MNRAS/426/1338 Southworth et al., Paper V 2013MNRAS.434.1300S, Cat. J/MNRAS/434/1300 Southworth et al., Paper VI 2014MNRAS.444..776S, Cat. J/MNRAS/444/776 Southworth et al., Paper VII 2015MNRAS.447..711S, Cat. J/MNRAS/447/711
(End) John Southworth [Keele Univ., UK], Patricia Vannier [CDS] 09-May-2018
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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