Possible image of an exoplanet next to Beta Pictoris

Page 4 of 4 Previous  1, 2, 3, 4

View previous topic View next topic Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Lazarus on 2nd May 2014, 9:58 am

Also from a read-through of the paper, it looks like at least some superjovian planets might spin very quickly indeed:
Over the next hundreds of millions of years the planet is expected to cool down and shrink to the size of Jupiter. If its angular moment is preserved during this process, the planet should spin up to Vspin ~ 40 km sec-1, depending on possible changes in its internal structure, decreasing its length of day to ~3 hours.

Lazarus
dG star
dG star

Number of posts : 2739
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Sirius_Alpha on 17th July 2014, 9:08 pm

The First H-band Spectrum of the Massive Gas Giant Planet beta Pictoris b with the Gemini Planet Imager
http://arxiv.org/abs/1407.4469

_________________
Caps Lock: Cruise control for 'Cool'!

Sirius_Alpha
Admin
Admin

Number of posts : 3375
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Lazarus on 18th July 2014, 2:31 am

Also:

Bonnefoy et al. "Physical and orbital properties of Beta Pictoris b"
http://arxiv.org/abs/1407.4001

Lazarus
dG star
dG star

Number of posts : 2739
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Lazarus on 11th September 2014, 5:20 pm

Kong et al. (2014) "The shape, internal structure and gravity of the fast spinner β Pictoris b"
http://mnrasl.oxfordjournals.org/content/445/1/L26

For masses 6–16 MJ, the eccentricity of the oblate spheroid ε ranges from 0.36928–0.23398, which correspond to oblateness values 0.071–0.028.

Assuming it shrinks and spins up to 1 Jupiter radius and 3 hour rotation, the range of ε ends up as 0.45552–0.29422, which gives oblateness values of 0.110–0.044.

For comparison, Saturn has an oblateness 0.098.

Lazarus
dG star
dG star

Number of posts : 2739
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Sirius_Alpha on 22nd October 2014, 1:27 pm

Two Families of Comets Found Around Nearby Star
http://www.eso.org/public/news/eso1432/

Link to paper.
http://www.eso.org/public/archives/releases/sciencepapers/eso1432/eso1432a.pdf



The HARPS instrument at ESO’s La Silla Observatory in Chile has been used to make the most complete census of comets around another star ever created. A French team of astronomers has studied nearly 500 individual comets orbiting the star Beta Pictoris and has discovered that they belong to two distinct families of exocomets: old exocomets that have made multiple passages near the star, and younger exocomets that probably came from the recent breakup of one or more larger objects. The new results will appear in the journal Nature on 23 October 2014.

Moreover, the orbits of these comets (eccentricity and orientation) are exactly as predicted for comets trapped in orbital resonance with a massive planet. The properties of the comets of the first family show that this planet in resonance must be at about 700 million kilometres from the star  — close to where the planet Beta Pictoris b was discovered.

_________________
Caps Lock: Cruise control for 'Cool'!

Sirius_Alpha
Admin
Admin

Number of posts : 3375
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Lazarus on 22nd October 2014, 4:35 pm

Nice. I seem to recall that there was previous work that suggested that there were two famillies of exocomets in the system, which was indeed used as a prediction of the presence of a planet before the discovery of Beta Pic b. Good to see it confirmed!

Lazarus
dG star
dG star

Number of posts : 2739
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Led_Zep on 19th February 2015, 5:15 pm

http://hubblesite.org/newscenter/archive/releases/2015/06/full/

Astronomers have used NASA's Hubble Space Telescope to take the most detailed picture to date of a large, edge-on, gas-and-dust disk encircling the 20-million-year-old star Beta Pictoris.

Led_Zep
Saturn-Mass
Saturn-Mass

Number of posts : 470
Location : France
Registration date : 2011-09-09

View user profile

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Sirius_Alpha on 22nd August 2015, 1:52 am

β PICTORIS’ INNER DISK IN POLARIZED LIGHT AND NEW ORBITAL PARAMETERS FOR β PICTORIS b
http://arxiv.org/abs/1508.04787

They find a transit probability of ~0.06%, but note that it appears certain now that the planet's Hill sphere at least will transit, similar to the situation at J1407.

_________________
Caps Lock: Cruise control for 'Cool'!

Sirius_Alpha
Admin
Admin

Number of posts : 3375
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Led_Zep on 8th July 2016, 4:59 am

Slide from Davos meeting :


Led_Zep
Saturn-Mass
Saturn-Mass

Number of posts : 470
Location : France
Registration date : 2011-09-09

View user profile

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Lazarus on 8th July 2016, 1:30 pm

Pity, it was so close. But nevertheless a chance to see if there's something like the J1407 ring.

Lazarus
dG star
dG star

Number of posts : 2739
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Sirius_Alpha on 19th July 2016, 8:45 pm

Paper.
The Orbit and Transit Prospects for β Pictoris b constrained with One Milliarcsecond Astrometry
http://arxiv.org/abs/1607.05272

_________________
Caps Lock: Cruise control for 'Cool'!

Sirius_Alpha
Admin
Admin

Number of posts : 3375
Location : Earth
Registration date : 2008-04-06

View user profile http://solar-flux.forumandco.com/

Back to top Go down

Re: Possible image of an exoplanet next to Beta Pictoris

Post by Sponsored content Today at 10:00 am


Sponsored content


Back to top Go down

Page 4 of 4 Previous  1, 2, 3, 4

View previous topic View next topic Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum