Upsilon Andromedae: 4th planet and non-coplanarity

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Re: Upsilon Andromedae: 4th planet and non-coplanarity

Post by Sirius_Alpha on 1st May 2010, 7:25 pm

With the recent talk about hot Jupiters and Kozai oscillations, I'm forced to wonder what would be the effect on υ And Ad on υ And Ac, or even on υ And Ab, and perhaps even υ And B. How much does the possible existence of this fourth planet affect the interpretation of the astrometric motion of the star?

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Re: Upsilon Andromedae: 4th planet and non-coplanarity

Post by Lazarus on 8th May 2010, 6:17 am

The paper's up here (behind paywall), and some of the parameters at EPE are updated.
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Re: Upsilon Andromedae: 4th planet and non-coplanarity

Post by Borislav on 8th May 2010, 8:16 am

Beautiful planetary system. Four massive planets and the second star - red dwarf in the Oort cloud.

This Rosetta stone for studying the dynamics of multi-planetary systems. First multi-planetary system discovery around simple stars. Also famous for the first temperature map of exoplanets.

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Re: Upsilon Andromedae: 4th planet and non-coplanarity

Post by Borislav on 8th May 2010, 9:00 am

In addition, it appears that all three outer planets are good targets for the photographic detection.

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Re: Upsilon Andromedae: 4th planet and non-coplanarity

Post by Sirius_Alpha on 19th October 2010, 10:02 am

It's been argued based on the stellar inclination that the planets may have inclinations of 58.

More info here.
Not sure how well this holds up to HST astrometric determination of their orbits (if at all). Though, HST astrometry doesn't seem to have always been reliable in all cases.

Similar arguments are made for the planets orbiting HD 10697, ε Eri, HD 130322, HD 3651, HD 69830, HD 89744, HD 154345, 51 Peg, and HD 92788.


Last edited by Sirius_Alpha on 19th October 2010, 10:20 am; edited 2 times in total (Reason for editing : Added systems.)

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Re: Upsilon Andromedae: 4th planet and non-coplanarity

Post by Lazarus on 19th October 2010, 12:33 pm

I think this is related to the second paper linked in this thread.
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Re: Upsilon Andromedae: 4th planet and non-coplanarity

Post by Lazarus on 11th November 2010, 4:39 am

Study of the dynamics of the system - concludes that planet-planet scattering was probably the cause of the misalignment, but it is not possible to determine whether the companion star was responsible for causing the scattering.
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Re: Upsilon Andromedae: 4th planet and non-coplanarity

Post by Lazarus on 15th November 2010, 1:20 pm

A&A forthcoming:
A fourth planet orbiting upsilon Andromedae?
S. Curiel, J. Canto, L. Georgiev, C. Chavez, A. Poveda
Received: 03 September 2010 / Accepted: 07 November 2010
DOI: 10.1051/0004-6361/201015693
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Re: Upsilon Andromedae: 4th planet and non-coplanarity

Post by Lazarus on 6th November 2014, 1:31 pm

Wasn't sure whether to put this here or in the other Upsilon Andromedae thread...

Deitrick et al. "The 3-dimensional architecture of the Upsilon Andromedae planetary system"
http://arxiv.org/abs/1411.1059

Attempts to determine a stable orbit for Upsilon Andromedae b given the astrometric orbits for planets c and d.
These solutions predict bs mass is in the range 2 - 9 MJup and has an inclination angle from the sky plane of less than 25. Combined with brightness variations in the combined star/planet light curve (phase curve), our results imply that planet bs radius is ~1.8 RJup, relatively large for a planet of its age. However, the eccentricity of b in several of our stable solutions reaches > 0.1, generating upwards of 1019 watts in the interior of the planet via tidal dissipation, possibly inflating the radius to an amount consistent with phase curve observations.
There's also some interesting discussion about the evidence for the 4th planet, it does not look good for the Curiel et al. (2011) solution...
While a longer period planet, indicated by a small slope in the radial velocities, may exist in this system, the 4th planet signal reported by Curiel et al. (2011) was a product of the earlier reduction of the Lick data, which did not account for an instrument change that caused a shift in the γ. For this reason, we do not include this planet in our study.
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Re: Upsilon Andromedae: 4th planet and non-coplanarity

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