HAT-P-7: New stellar and planetary companion

View previous topic View next topic Go down

HAT-P-7: New stellar and planetary companion

Post by Sirius_Alpha on 21st September 2012, 12:28 am

A Common Proper Motion Stellar Companion to HAT-P-7
http://arxiv.org/abs/1209.4422

We report that HAT-P-7 has a common proper motion stellar companion. The companion is located at $\sim3.9$ arcsec to the east and estimated as an M5.5V dwarf based on its colors. We also confirm the presence of the third companion, which was first reported by Winn et al. (2009), based on long-term radial velocity measurements. We revisit the migration mechanism of HAT-P-7b given the presence of those companions, and propose sequential Kozai migration as a likely scenario in this system. This scenario may explain the reason for an outlier in the discussion of the spin-orbit alignment timescale for HAT-P-7b by Albrecht et al. (2012).

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3416
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: HAT-P-7: New stellar and planetary companion

Post by Lazarus on 21st September 2012, 3:03 am

In addition one from yesterday:

Stellar companions to exoplanet host stars: Lucky Imaging of transiting planet hosts
http://arxiv.org/abs/1209.4087

Confirmation of binary companions to TrES-4 and WASP-2, and new candidate stellar companions at HAT-P-8 and WASP-12
avatar
Lazarus
dG star
dG star

Number of posts : 2783
Registration date : 2008-06-12

View user profile

Back to top Go down

Re: HAT-P-7: New stellar and planetary companion

Post by Led_Zep on 12th December 2016, 12:55 pm

http://www2.warwick.ac.uk/newsandevents/news/winds_of_rubies/

Winds of rubies and sapphires strike the sky of giant planet

- Weather detected on HAT-P-7b – a planet 16x larger than Earth, over 1000 light years away
- First ever gas giant outside our solar system to reveal weather patterns
- Clouds on planet could be made of corundum, the mineral which forms rubies and sapphires
- Kepler satellite measured changes in the light reflected from planet


The paper, ‘Variability in the Atmosphere of the Hot Jupiter HAT-P-7’, is published in the first issue of Nature Astronomy.
avatar
Led_Zep
Jovian
Jovian

Number of posts : 506
Location : France
Registration date : 2011-09-09

View user profile

Back to top Go down

Re: HAT-P-7: New stellar and planetary companion

Post by Sirius_Alpha on 12th December 2016, 4:32 pm

Regarding the first weather detection: It's useful to remember HD 80606 b.

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3416
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: HAT-P-7: New stellar and planetary companion

Post by Sirius_Alpha on 13th December 2016, 9:50 pm

Paper is now on arXiv.

Variability in the Atmosphere of the Hot Giant Planet HAT-P-7 b
https://arxiv.org/abs/1612.04225

_________________
Caps Lock: Cruise control for 'Cool'!
avatar
Sirius_Alpha
Admin
Admin

Number of posts : 3416
Location : Earth
Registration date : 2008-04-06

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

Back to top Go down

Re: HAT-P-7: New stellar and planetary companion

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top


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