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TrES-4b

Hot Jupiter exoplanet orbiting a Sun-like star

Field	Value
name	TrES-4b
image	TrES-4.jpg
caption	Size comparison of TrES-4 with Jupiter
<!-- DISCOVERY -->	discoverer	Mandushev et al
discovered	2006–2007
discovery_method	Transit
<!-- ORBITAL -->	apsis	astron
semimajor	0.05091 ±
eccentricity	0
period	3.553945 ± 0.000075 d
inclination	82.86 ± 0.33
semi-amplitude	86.1
star	GSC 02620-00648 A
<!-- PHYS CHARS -->	mean_radius
mass
surface_grav	7.04 ±
0.718 ± 0.114 g
density
single_temperature	(1782 K, equilibrium)

| semi-amplitude = 86.1 0.718 ± 0.114 g TrES-4b is an exoplanet. It was discovered in 2006, and announced in 2007, by the Trans-Atlantic Exoplanet Survey, using the transit method. At the time of its discovery TrES-4 was the largest confirmed exoplanet ever found; now more than 10 larger planets have been discovered. It is approximately 1400 ly away orbiting the star GSC 02620-00648, in the constellation Hercules.

Orbit

TrES-4 orbits its primary star every 3.543 days and eclipses it when viewed from Earth.

A 2008 study concluded that the GSC 02620-00648 system (among others) is a binary star system allowing even more accurate determination of stellar and planetary parameters.{{cite journal| url=http://www.mpia.de/homes/henning/Publications/daemgen.pdf| title=Binarity of transit host stars - Implications for planetary parameters| date=2009| volume=498

The study in 2012, utilizing a Rossiter–McLaughlin effect, have determined the planetary orbit is probably aligned with the equatorial plane of the star, misalignment equal to °.

Physical characteristics

The planet is slightly less massive than Jupiter (0.919 ± 0.073 ) but its diameter is 84% larger. This give TrES-4 an average density of only about a third of a gram per cubic centimetre, approximately the same as Saturn's moon Methone. At the time of its discovery in 2007, TrES-4 was described as both the largest known planet and the planet with the lowest known density.

TrES-4b's orbital radius is 0.05091 AU, giving it a predicted surface temperature of about 1782 K. This by itself is not enough to explain the planet's low density, however. It is not currently known why TrES-4b is so large. The probable causes are the proximity to a parent star that is three to four times more luminous than the Sun as well as the internal heat within the planet.

References

(2018-11-01). "Revised Exoplanet Radii and Habitability Using Gaia Data Release 2". The Astrophysical Journal Supplement Series.
(2015). "The GAPS programme with HARPS-N at TNG VI. The curious case of TrES-4b". Astronomy & Astrophysics.
Mandushev, Georgi. (2007). "TrES-4: A Transiting Hot Jupiter of Very Low Density". The Astrophysical Journal Letters.
(2012). "Obliquities of Hot Jupiter Host Stars: Evidence for Tidal Interactions and Primordial Misalignments". The Astrophysical Journal.

Info: Wikipedia Source

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hercules-(constellation) hot-jupiters transiting-exoplanets exoplanets-discovered-in-2006 giant-planets

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