Home     Baþlangýç     Evrende yaþayabilmek için    
Inhabited Sky
    News@Sky     Gökyüzü görüntüsü     Koleksiyon     Forum     Blog New!     SSS     Basýn     Giriþ  

TYC 1482-882-1


Ýçindekiler

Görüntüler

Resim Yükleyin

DSS Images   Other Images


Ýlgili Makaleler

Transiting exoplanets from the CoRoT space mission . VI. CoRoT-Exo-3b: the first secure inhabitant of the brown-dwarf desert
Context: The CoRoT space mission routinely provides high-precisionphotometric measurements of thousands of stars that have beencontinuously observed for months. Aims: The discovery andcharacterization of the first very massive transiting planetarycompanion with a short orbital period is reported. Methods: A series of34 transits was detected in the CoRoT light curve of an F3V star,observed from May to October 2007 for 152 days. The radius wasaccurately determined and the mass derived for this new transiting,thanks to the combined analysis of the light curve and complementaryground-based observations: high-precision radial-velocity measurements,on-off photometry, and high signal-to-noise spectroscopic observations. Results: CoRoT-Exo-3b has a radius of 1.01 ± 0.07 R_Jup andtransits around its F3-type primary every 4.26 days in a synchronousorbit. Its mass of 21.66 ± 1.0 M_Jup, density of 26.4 ±5.6 g cm-3, and surface gravity of logg = 4.72 clearlydistinguish it from the regular close-in planet population, making itthe most intriguing transiting substellar object discovered so far. Conclusions: With the current data, the nature of CoRoT-Exo-3b isambiguous, as it could either be a low-mass brown-dwarf or a member of anew class of “superplanets”. Its discovery may helpconstrain the evolution of close-in planets and brown-dwarfs better.Finally, CoRoT-Exo-3b confirms the trend that massive transiting giantplanets (M ≥ 4 M_Jup) are found preferentially around more massivestars than the Sun.The CoRoT space mission, launched on December 27th 2006, has beendeveloped and is operating by CNES, with the contribution of Austria,Belgium, Brasil, ESA, Germany and Spain. The first CoRoT data will beavailable to the public in February 2009 from the CoRoT archive:http://idoc-corot.ias.u-psud.fr/ Table of the COROT photometry is onlyavailable in electronic form at the CDS via anonymous ftp tocdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/491/889

On the Origins of Eccentric Close-In Planets
Strong tidal interaction with the central star can circularize theorbits of close-in planets. With the standard tidal quality factor Q ofour solar system, estimated circularization times for close-inextrasolar planets are typically shorter than the ages of the hoststars. While most extrasolar planets with orbital radii a<~0.1 AUindeed have circular orbits, some close-in planets with substantialorbital eccentricities have recently been discovered. This new class ofeccentric close-in planets implies that either their tidal Q factor isconsiderably higher, or circularization is prevented by an externalperturbation. Here we constrain the tidal Q factor for transitingextrasolar planets by comparing their circularization times withaccurately determined stellar ages. Using estimated secular perturbationtimescales, we also provide constraints on the properties ofhypothetical second planets exterior to the known ones.

Yeni bir Makale Öner


Ýlgili Baðlantýlar

  • - Baðlantý Bulunamadý -
Yeni Bir Baðlantý Öner


sonraki gruplarýn üyesi:


Gözlemler ve gökölçümü verileri

Takýmyýldýz:Coban
Sað Açýklýk:14h33m06.36s
Yükselim:+21°53'41.0"
Görünürdeki Parlaklýk:9.754
özdevim Sað Açýklýk:29.1
özdevim Yükselim:-5.3
B-T magnitude:10.28
V-T magnitude:9.798

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
TYCHO-2 2000TYC 1482-882-1
USNO-A2.0USNO-A2 1050-07217001

→ VizieR 'den daha fazla katalog ve tanýmlama isteyin