SETI bioastro: A Neptune-mass planet around the nearby M dwarf Gl 581

• Previous message: LARRY KLAES: "SETI bioastro: Papers on White Dwarf Systems"

Paper: astro-ph/0509211
Date: Thu, 8 Sep 2005 10:33:42 GMT (80kb)

Title: The HARPS search for southern extra-solar planets. VI. A Neptune-mass
planet around the nearby M dwarf Gl 581

Authors: X. Bonfils, T. Forveille, X. Delfosse, S. Udry, M. Mayor, C. Perrier,
F. Bouchy, F. Pepe, D. Queloz, J.-L. Bertaux

Comments: letter submitted to A&A
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We report the discovery of a Neptune-mass planet around Gl 581 (M3V, M = 0.31
Msol), based on precise Doppler measurements with the HARPS spectrograph at La
Silla Observatory. The radial velocities reveal a circular orbit of period P =
5.366 days and semi-amplitude K1 = 13.2 m/s. The resulting minimum mass of the
planet (m2 sin i) is only 0.052 Mjup = 0.97 Mnep = 16.6 Mearth making Gl 581b
one of the lightest extra-solar planet known to date. The Gl 581 planetary
system is only the third centered on an M dwarf, joining the Gl 876
three-planet system and the lone planet around Gl 436. Its discovery reinforces
the emerging tendency of such planets to be of low mass, and found at short
orbital periods. The statistical properties of the planets orbiting M dwarfs do
not seem to match a simple mass scaling of their counterparts around solar-type
stars.

\\ ( http://arXiv.org/abs/astro-ph/0509211 , 80kb)

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Paper: astro-ph/0507492
replaced with revised version Thu, 8 Sep 2005 01:38:16 GMT (344kb)

Title: Planetary migration

Authors: Philip J. Armitage, W. K. M. Rice

Comments: Revised version corrects summary of simulation results on co-orbital
torques. To appear in, "A Decade Of Extrasolar Planets Around Normal Stars",
STScI May Symposium 2005. Accompanying animation of migration regimes at
http://jilawww.colorado.edu/~pja/planet_migration.html

\\ ( http://arXiv.org/abs/astro-ph/0507492 , 344kb)

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Paper: astro-ph/0508109
replaced with revised version Thu, 8 Sep 2005 11:31:37 GMT (57kb)

Title: On the potential of extrasolar planet transit surveys

Authors: M. Gillon (Liege univ., Belgium), F. Courbin (EPFL, Switzerland), P.
Magain (Liege univ., Belgium), B. Borguet (Liege univ., Belgium)

Comments: accepted in AA

\\ ( http://arXiv.org/abs/astro-ph/0508109 , 57kb)

• Previous message: LARRY KLAES: "SETI bioastro: Papers on White Dwarf Systems"

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