MARVELS-1b

MARVELS-1b: A Short-Period, Brown Dwarf Desert Candidate from the SDSS-III MARVELS Planet Search

Minimum mass of 28 Jupiter masses orbiting the F9 star TYC 1240-00945-1.

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/1304.2815

A 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?

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.

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.

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.

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.

http://arxiv.org/abs/1305.0280

NO PLANET !! (or brown dwarf,exactly...)

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...

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.

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

I've merged the MARVELS threads.

There's an interesting series of blog posts about MARVELS-1 by Jason Wright.
Part 1
Part 2
Part 3
Part 4
Part 5
Part 6