HD 38283 b - A Saturn-mass planet 1 AU from a F9.5V star

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HD 38283 b - A Saturn-mass planet 1 AU from a F9.5V star

Post by Sirius_Alpha on 13th April 2011, 2:02 am

http://exoplanet.eu/planet.php?p1=HD+38283&p2=b

From
http://iopscience.iop.org/0004-637X/732/1/31
We have detected the Doppler signature of a gas-giant exoplanet orbiting the star HD 38283, in an eccentric orbit with a period of almost exactly one year (P = 363.2 1.6 d, m sin i = 0.34 0.02 M Jup, e = 0.41 0.16). The detection of a planet with period very close to one year critically relied on year-round observation of this circumpolar star. Discovering a planet in a 1 AU orbit around a G dwarf star has prompted us to look more closely at the question of the habitability of the satellites of such planets. Regular satellites orbit all the giant planets in our solar system, suggesting that their formation is a natural by-product of the planet formation process. There is no reason for exomoon formation not to be similarly likely in exoplanetary systems. Moreover, our current understanding of that formation process does not preclude satellite formation in systems where gas giants undergo migration from their formation locations into the terrestrial planet habitable zone. Indeed, regular satellite formation and Type II migration are both linked to the clearing of a gap in the protoplanetary disk by a planet, and so may be inextricably linked. Migration would also multiply the chances of capturing both irregular satellites and Trojan companions sufficiently massive to be habitable. The habitability of such exomoons and exo-Trojans will critically depend on their mass, whether or not they host a magnetosphere, and (for the exomoon case) their orbital radius around the host exoplanet.

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Re: HD 38283 b - A Saturn-mass planet 1 AU from a F9.5V star

Post by Lazarus on 13th April 2011, 3:37 am

Wonder when exomoons will actually start being detected, especially now we've got both Kepler and CoRoT working.
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Re: HD 38283 b - A Saturn-mass planet 1 AU from a F9.5V star

Post by Edasich on 13th April 2011, 4:48 am

Well parent star's luminosity seems not so favourable to habitable environments at all (L=2.4 x Sun, source NSTed, no access to fulltext neither preprint)
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Re: HD 38283 b - A Saturn-mass planet 1 AU from a F9.5V star

Post by tommi59 on 13th April 2011, 4:50 am

Next gas giant in( the very inner edge of) habitable zone-but in this case eccentricity makes creating life on moons almost impossible.I allege first exomoon will be detected in 2012
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Re: HD 38283 b - A Saturn-mass planet 1 AU from a F9.5V star

Post by Lazarus on 13th April 2011, 6:37 pm

Edasich wrote:Well parent star's luminosity seems not so favourable to habitable environments at all (L=2.4 x Sun, source NSTed, no access to fulltext neither preprint)
The eccentric orbit isn't too good either. Planets on eccentric orbits receive more stellar flux over the course of an orbit than those on circular ones with the same semimajor axis. IIRC Trojan configurations at high eccentricities are possible but they look quite weird...

Also is the Anglo-Australian Planet Search not publishing on arXiv? The paper about the isolated Neptune HD 102365b also didn't appear there...
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Re: HD 38283 b - A Saturn-mass planet 1 AU from a F9.5V star

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