HD 95086 b - ~4.5 M_J planet from direct imaging

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HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Sirius_Alpha on 2nd June 2013, 11:54 pm

A gas giant planet orbiting HD 95086 from direct imaging. It's the lightest planet directly imaged (Fomalhaut b... whatever that actually is... notwithstanding)

Discovery of a probable 4-5 Jupiter-mass exoplanet to HD 95086 by direct-imaging
http://arxiv.org/abs/1305.7428

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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by jyril on 3rd June 2013, 7:50 am

ESO press release

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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Sirius_Alpha on 4th September 2013, 10:33 am

Further Evidence of the Planetary Nature of HD 95086 b from Gemini/NICI H-band Data
http://arxiv.org/abs/1309.0543

H-band non-detection supporting a sub-stellar upper mass limit.

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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Sirius_Alpha on 8th September 2013, 8:51 pm

A resolved debris disk around the candidate planet-hosting star HD95086
http://arxiv.org/abs/1309.1675

Looks like the system has an inclination of 25 degrees, with the planet on the edge of the disk.

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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Sirius_Alpha on 28th October 2013, 8:28 pm

Confirmation of the planet around HD 95086 by direct imaging
http://arxiv.org/abs/1310.7483

VLT/NaCo angular differential imaging at L' (3.8 microns) revealed a probable giant planet comoving with the young and early-type HD 95086 also known to harbor an extended debris disk. The discovery was based on the proper motion analysis of two datasets spanning 15 months. However, the second dataset suffered from bad atmospheric conditions, which limited the significance of the redetection at the 3 sigma level. In this Letter, we report new VLT/NaCo observations of HD 95086 obtained on 2013 June 26-27 at L' to recover the planet candidate. We unambiguously redetect the companion HD 95086 b with multiple independent pipelines at a signal-to-noise ratio greater than or equal to 5. Combined with previously reported measurements, our astrometry decisively shows that the planet is comoving with HD 95086 and inconsistent with a background object. With a revised mass of 5 pm 2 Jupiter masses, estimated from its L' photometry and "hot-start" models at 17 pm 4 Myr, HD 95086 b becomes a new benchmark for further physical and orbital characterization of young giant planets.

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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Sirius_Alpha on 21st April 2014, 2:54 pm

GPI detection of HD 95086 b
http://arxiv.org/abs/1404.4635

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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Led_Zep on 11th November 2014, 12:44 pm

http://spaceref.com/astronomy/follow-the-dust-to-find-planets.html

"...Researchers studying what appears to be a beefed-up version of our solar system have discovered that it is encased in a halo of fine dust. The findings are based on infrared data from NASA's Spitzer Space Telescope and the European Space Agency's Herschel Space Observatory, in which NASA is a partner..."

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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Edasich on 17th November 2014, 4:19 am

I was not sure whether opening a separate thread about this paper:

Planets Around Low-Mass Stars (PALMS). IV. The Outer Architecture of M Dwarf Planetary Systems

We present results from a high-contrast adaptive optics imaging search for giant planets and brown dwarfs (>1 MJup) around 122 newly identified nearby (<40 pc) young M dwarfs. Half of our targets are younger than 135 Myr and 90% are younger than the Hyades (620 Myr). Our H- and K-band coronagraphic observations with Keck/NIRC2 and Subaru/HiCIAO achieve typical contrasts of 12-14 mag and 9-13 mag at 1", respectively, which corresponds to limiting planet masses of 0.5-10 MJup at 5-33 AU for 85% of our sample. We discovered four young brown dwarf companions: 1RXS J235133.3+312720 B (32 6 MJup; L0+2−1; 120 20 AU), GJ 3629 B (64+30−23 MJup; M7.5 0.5; 6.5 0.5 AU), 1RXS J034231.8+121622 B (35 8 MJup; L0 1; 19.8 0.9 AU), and 2MASS J15594729+4403595 B (43 9 MJup; M8.0 0.5; 190 20 AU). Over 150 candidate planets were identified; we obtained follow-up imaging for 56% of these but all are consistent with background stars. Our null detection of planets enables strong statistical constraints on the occurrence rate of long-period giant planets around single M dwarfs. We infer an upper limit (at the 95% confidence level) of 10.3% and 16.0% for 1-13 MJup planets between 10-100 AU for hot-start and cold-start (Fortney) evolutionary models, respectively. Fewer than 6.0% (9.9%) of M dwarfs harbor massive gas giants in the 5-13 MJup range like those orbiting HR 8799 and β Pictoris between 10-100 AU for a hot-start (cold-start) formation scenario. Although the first directly imaged planets were found around massive stars, there is currently no statistical evidence for a trend of giant planet frequency with stellar host mass at large separations as predicted by the disk instability model of giant planet formation.
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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Lazarus on 17th November 2014, 4:51 pm

Hmmm that one's about planets around M dwarfs, while HD 95086 is an A8 star. So I'd go with a separate thread...

Interesting result on the statistical dependence though: perhaps the dearth of RV giant planets around low-mass stars is due to M dwarfs being less efficient at migrating the planets into the inner system rather than being less good at forming such objects, or that the wide-orbit objects are formed by a different mechanism (disc instabllity) than gas giant planets closer in.
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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Sirius_Alpha on 2nd December 2014, 1:54 am

It's now on arXiv.

Debris Distribution in HD 95086 - A Young Analog of HR 8799
http://arxiv.org/abs/1412.0167

Outer disk at ~55 K, warm disk at ~175 K, unconfirmed third component at ~300 K suggesting forming terrestrial planets. Cold halo out to ~800 AU. Spectrum consistent with iron-poor, crystalline olivine likely comprising ~5% of the disk.

The gap between the warm and cold disk can be explained by the presence of planets. For the b planet alone to produce the gap, it needs an eccentricity of 0.7 to clear out the gap. They find that the presence of three planets of ~7 MJ at 12, 26, 56 AU can maintain the gap and be stable. Four planets can accomplish this as well, but with some significant fine-tuning with mean motion resonances (which may be the case at HR 8799 anyway).

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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

Post by Sirius_Alpha on 6th April 2016, 11:53 pm

Spectroscopic characterization of HD 95086 b with the Gemini Planet Imager
http://arxiv.org/abs/1604.01411

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Re: HD 95086 b - ~4.5 M_J planet from direct imaging

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