J/A+A/575/L15 TrES-4b RV and Ic curves (Sozzetti+, 2015)
The GAPS programme with HARPS-N at TNG. VI. The curious case of TrES-4b.
Sozzetti A., Bonomo A.S., Biazzo K., Mancini L., Damasso M., Desidera S.,
Gratton R., Lanza A.F., Poretti E., Rainer M., Malavolta L., Affer L.,
Barbieri M., Bedin L.R., Boccato C., Bonavita M., Borsa F., Ciceri S.,
Claudi R.U., Gandolfi D., Giacobbe P., Henning T., Knapic C., Latham D.W.,
Lodato G., Maggio A., Maldonado J., Marzari F., Martinez Fiorenzano A.F.,
Micela G., Molinari E., Mordasini C., Nascimbeni V., Pagano I., Pedani M.,
Pepe F., Piotto G., Santos N., Scandariato G., Shkolnik E., Southworth J.
<Astron. Astrophys., 575, L15-15 (2015)>
=2015A&A...575L..15S 2015A&A...575L..15S
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry ;
Radial velocities
Keywords: stars: individual: TrES-4b - planetary systems -
techniques: radial velocities - techniques: spectroscopic -
techniques: photometric
Abstract:
We update the TrES-4 system parameters using high-precision HARPS-N
radial-velocity measurements and new photometric light curves. A
combined spectroscopic and photometric analysis allows us to determine
a spectroscopic orbit with a semi-amplitude K=51±3m/s. The derived
mass of TrES-4b is found to be Mp=0.49±0.04MJup, significantly
lower than previously reported. Combined with the large radius
(Rp=1.84-0.09+0.08RJup) inferred from our analysis, TrES-4b
becomes the transiting hot Jupiter with the second-lowest density
known. We discuss several scenarios to explain the puzzling
discrepancy in the mass of TrES-4b in the context of the exotic class
of highly inflated transiting giant planets.
Description:
The TrES-4 system was observed with HARPS-N on 17 individual epochs
between March 2013 and July 2014.
We carried out Ic-band precision photometric observations of two
complete transit events of TrES-4 b with the CAHA 1.23-m on UT 2013
July 6 and UT 2014 June 30.
Objects:
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RA (2000) DE Designation(s)
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17 53 13.06 +37 12 42.4 TrES-4b = NAME TrES-4b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 17 HARPS-N systemic radial velocities, formal errors,
bisector spans, and chromospheric activity index
of TrES-4
table3.dat 29 454 Differential photometry of TrES-4
(Ic band, CAHA 1.23-m)
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See also:
J/A+A/554/A28 : Qatar-1 differential light curve (Covino+, 2013)
J/A+A/575/A111 : GAPS. V: Global analysis of the XO-2 system (Damasso+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Barycentric JD for the midpoint of observation
(TDB) (BJD-2450000)
13- 19 F7.3 km/s gamma Systemic radial velocity γ
21- 25 F5.3 km/s e_gamma rms uncertainty on gamma
27- 32 F6.3 km/s BS Bisector Span
34- 39 F6.3 [-] logR'HK [-5.4/-5.0] Chromospheric activity index
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.6 d BJD Barycentric JD for the midpoint of observation
(TDB) (BJD-2450000)
13- 20 F8.6 --- Rflux [0.9875/1.0021] Relative Ic flux
22- 29 F8.6 --- e_Rflux [[0.0007/0.0009] rms uncertainty on mag
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History:
From electronic version of the journal
References:
Covino et al., Paper I 2013A&A...554A..28C 2013A&A...554A..28C, Cat. J/A+A/554/A28
Desidera et al., Paper II 2013A&A...554A..29D 2013A&A...554A..29D
Esposito et al., Paper III 2014A&A...564L..13E 2014A&A...564L..13E
Desidera et al., Paper IV 2014A&A...567L...6D 2014A&A...567L...6D
Damasso et al., Paper VII 2015A&A...575A.111D 2015A&A...575A.111D, Cat. J/A+A/575/A111
(End) Patricia Vannier [CDS] 03-Jun-2015