* Astronomy

Members Login
Post Info TOPIC: WASP-14b extrasolar planet


L

Posts: 131433
Date:
RE: WASP-14b extrasolar planet
Permalink  
 


Title: Thermal Emission of WASP-14b Revealed with Three Spitzer Eclipses
Authors: Jasmina Blecic, Joseph Harrington, Nikku Madhusudhan, Kevin B. Stevenson, Ryan A. Hardy, Christopher J. Campo, William C. Bowman, Sarah Nymeyer, Patricio Cubillos, David R. Anderson

WASP-14b belongs to a class of highly irradiated hot Jupiters (Teq = 1866 K) with a mass of 7.3 0.5 MJ and a radius of 1.28 0.08 RJ . With a mean density of 4.6 gcm-3, this transiting planet is one of the densest known to date (Joshi et al. 2009), for planets with periods less than 3 days. We present analytic light-curve models for three Spitzer secondary eclipses, Keplerian orbital model, estimates of infrared brightness temperatures, and constraints on atmospheric composition and thermal structure. Although extremely irradiated, WASP-14b does not show any distinctive evidence of a thermal inversion, based on existing observations. In addition, the observations indicate low day-night redistribution (fr<0.25) and are consistent with chemical compositions at nearly solar abundances. We confirm a significant eccentricity of e = 0.087 0.002 and refine other orbital parameters.

Read more (1762kb, PDF)



__________________


L

Posts: 131433
Date:
Permalink  
 

Title: WASP-14b: 7.3 Mj transiting planet in an eccentric orbit
Authors: Y. C. Joshi, D. Pollacco, A. Collier Cameron, I. Skillen, E. Simpson, I. Steele, R. A. Street, H. C. Stempels, D. J. Christian, L. Hebb, F. Bouchy, N. P. Gibson, G. Hebrard, F. P. Keenan, B. Loeillet, J. Meaburn, C. Moutou, B. Smalley, I. Todd, R. G. West, D. Anderson, S. Bentley, B. Enoch, C. A. Haswell, C. Hellier, K. Horne, J. Irwin, T. A. Lister, I. McDonald, P. Maxted, M. Mayor, A. J. Norton, N. Parley, C. Perrier, F. Pont, D. Queloz, R. Ryans, A. M. S. Smith, S. Udry, P. J. Wheatley, D. M. Wilson
(Version v2)

We report the discovery of a 7.3 Mjup exoplanet WASP-14b, one of the most massive transiting exoplanets observed to date. The planet orbits the tenth-magnitude F5V star USNO-B1 11118-0262485 with a period of 2.243752 days and orbital eccentricity e = 0.09. A simultaneous fit of the transit light curve and radial velocity measurements yields a planetary mass of 7.3 0.5 Mjup and a radius of 1.28 0.08 Rjup. This leads to a mean density of about 4.6 g/cm making it densest transiting exoplanets yet found at an orbital period less than 3 days. We estimate this system to be at a distance of 160 20 pc. Spectral analysis of the host star reveals a temperature of 6475 100 K, log g = 4.07 cm/s and vsin i = 4.9 1.0 km/s, and also a high lithium abundance, log N(Li} = 2.84 0.05. The stellar density, effective temperature and rotation rate suggest an age for the system of about 0.5-1.0 Gyr.

Read more (161kb, PDF)

__________________


L

Posts: 131433
Date:
Permalink  
 

Title: WASP-14b: A 7.7 Mjup transiting exoplanet in an eccentric orbit
Authors: Y. C. Joshi, D. Pollacco, A. Collier Cameron, I. Skillen, E. Simpson, I. Steele, R. A. Street, H. C. Stempels, F. Bouchy, D. J. Christian, N. P. Gibson, L. Hebb, G. Hebrard, F. P. Keenan, B. Loeillet, J. Meaburn, C. Moutou, B. Smalley, I. Todd, R. G. West, D. Anderson, S. Bentley, B. Enoch, C. A. Haswell, C. Hellier, K. Horne, J. Irwin, T. A. Lister, I. McDonald, P. Maxted, M. Mayor, A. J. Norton, N. Parley, C. Perrier, F. Pont, D. Queloz, R. Ryans, A. M. S. Smith, S. Udry, P. J. Wheatley, D. M. Wilson

We report the discovery of a 7.7 Mjup exoplanet WASP-14b, one of the most massive transiting exoplanets observed to date. The planet orbits the tenth-magnitude F5V star USNO-B1 11118-0262485 with a period of 2.243756 days and orbital eccentricity e = 0.095. A simultaneous fit of the transit light curve and radial velocity measurements yields a planetary mass of 7.7(+0.4)(-0.7) Mjup and a radius of 1.26(+0.08)(-0.06) Rjup. This leads to a mean density of about 5.1 gcm^{-3} making it one of the densest transiting exoplanets yet found at an orbital period less than 3 days. We estimate this system to be at a distance of 16020 pc. Spectral analysis of the host star reveals a temperature of 6475100 K, log g = 4.33 cms^{-2} and v sin i = 4.91.0 km s^{-1}, and also a high lithium abundance, log N(Li) = 2.840.05. The stellar density, effective temperature and rotation rate suggest an age for the system of about 0.5--1.0 Gyr.

Read more (216kb, PDF)

__________________
Page 1 of 1  sorted by
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard