| MARVELS-1b | |
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: MARVELS-1b 24th November 2010, 2:11 pm | |
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: MARVELS-6b: substellar companion in the brown dwarf desert 11th April 2013, 2:12 pm | |
| Very Low Mass Stellar and Substellar Companions to Solar-Like Stars From MARVELS V: A Low Eccentricity Brown Dwarf from the Driest Part of the Desert, MARVELS-6b http://arxiv.org/abs/1304.2815A substellar object in a 48-day orbit around the star GSC 03546-01452. The minimum mass is in the "driest" part of the brown dwarf desert. Maybe this suggests that the orbit is actually closer to face-on? | |
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Shellface Neptune-Mass
Number of posts : 283 Location : g2 17.∞ 997 t Registration date : 2013-02-14
| Subject: Re: MARVELS-1b 11th April 2013, 3:38 pm | |
| Holy carapace, an Fe/H of 0.4! That's an enormous value - there's only… a few dozen stars with known (primordial) metallicities that high, and most of those are planet hosts.
Since super metal-rich stars are capable of forming very massive planetary systems (such as HD 202206 and HD 38529), it doesn't seem impossible that this brute could've formed via core accretion, perhaps if it contains most of the protoplanetary disk's worth of material… though it would be the most extreme case so far. | |
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: MARVELS-1b 13th April 2013, 2:31 pm | |
| Just checked on the exoplanets.org data plot: [Fe/H] 0.4 is certainly beyond the main peak of the exoplanet host stars distribution! Quick summary of the other MARVELS discoveries: Pilot project discovery, apparently not given a MARVELS-number - brown dwarf candidate ( thread) MARVELS-1b - brown dwarf candidate ( thread) MARVELS-2b - substellar minimum mass, likely to be a star if aligned with host star rotation MARVELS-3B - low-mass stellar companion MARVELS-4b - brown dwarf candidate (hopefully I didn't miss any threads) MARVELS-5b doesn't seem to be published yet, nor is there a paper numbered IV in the "Very Low-mass Stellar and Substellar Companions to Solar-like Stars from Marvels" series. | |
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Edasich dK star
Number of posts : 2289 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: MARVELS-1b 28th April 2013, 7:00 am | |
| - Lazarus wrote:
- MARVELS-1b - brown dwarf candidate (thread)
From http://www.linea.gov.br/publicacoes/ something more about this "former" BD candidate: - Quote :
- 1. MARVELS-1: A Face-on Double-lined Binary Masquerading as a Resonant Planetary System and Consideration of Rare False Positives in Radial Velocity Planet Searches. Wright, J. et al. 2013, ApJ, submetido.
And something more about upcoming papers... - Quote :
- 1.Very Low Mass Stellar and Substellar Companions to Solar-like Stars From MARVELS IV: A Candidate Brown Dwarf or Low-Mass Stellar Companion to HIP 67526. Jiang, P. et al. 2013, AJ, submetido.
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pochimax Planetary Embryo
Number of posts : 89 Location : Torrejon, Spain Registration date : 2011-09-09
| Subject: Re: MARVELS-1b 29th April 2013, 5:46 am | |
| It seems they are very far away from detecting planets with this instrument. It' s a pity, i think we really need a multi object spectrograph to increase the radial velocity planet harvest. | |
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Led_Zep SuperJovian
Number of posts : 721 Location : France Registration date : 2011-09-09
| Subject: Re: MARVELS-1b 2nd May 2013, 8:40 pm | |
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Edasich dK star
Number of posts : 2289 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: MARVELS-1b 3rd May 2013, 3:41 am | |
| We were talking about this right here in this thread indeed. But the nasty thing is that they point out before characterization they were thinking of a planetary system made up by a brown dwarf at 6 days and an inner hot Jupiter at 1.9 days or so. Instead it's a G dwarf at i = ca. 2.5°. Awwwww.... tantalizing... | |
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: MARVELS-1b 3rd May 2013, 4:14 pm | |
| Yeah maybe we need to merge the MARVELS threads?
Certainly an interesting and tricky false positive this one! Section 6.8 discusses the susceptibility of the MARVELS survey to this kind of effect. | |
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: MARVELS-1b 16th June 2013, 4:55 pm | |
| In a similar vein, another MARVELS false positive: A Cautionary Tale: MARVELS Brown Dwarf Candidate Reveals Itself To Be A Very Long Period, Highly Eccentric Spectroscopic Stellar Binary http://arxiv.org/abs/1306.3157 | |
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: MARVELS-1b 25th July 2013, 12:52 am | |
| _________________ Caps Lock: Cruise control for 'Cool'!
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| MARVELS-1b | |
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