|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
27 April 2024 |
|
| | | | |
|
Article forum
| |
|
|
The HU Aqr planetary system hypothesis revisited | | K. Gozdziewski
; A. Slowikowska
; D. Dimitrov
; K. Krzeszowski
; M. Zejmo
; G.Kanbach
; V. Burwitz
; A. Rau
; P. Irawati
; A. Richichi
; M. Gawronski
; G. Nowak
; I. Nasiroglu
; D. Kubicki
; | | Date: |
18 Dec 2014 | | Abstract: | We study the mid-egress eclipse timing data gathered for the cataclysmic
binary HU Aquarii during the years 1993-2014. The (O-C) residuals were
previously attributed to a single ~7 Jupiter mass companion in ~5 au orbit or
to a stable 2-planet system with an unconstrained outermost orbit. We present
22 new observations gathered between June, 2011 and July, 2014 with four
instruments around the world. They reveal a systematic deviation of ~60 - 120
seconds from the older ephemeris. We re-analyse the whole set of the timing
data available. Our results provide an erratum to the previous HU Aqr planetary
models, indicating that the hypothesis for a third and fourth body in this
system is uncertain. The dynamical stability criterion and a particular
geometry of orbits rule out coplanar 2-planet configurations. A putative HU Aqr
planetary system may be more complex, e.g., highly non-coplanar. Indeed, we
found examples of 3-planet configurations with the middle planet in a
retrograde orbit, which are stable for at least 1Gyr, and consistent with the
observations. The (O-C) may be also driven by oscillations of the gravitational
quadrupole moment of the secondary, as predicted by the Lanza et al.
modification of the Applegate mechanism. Further systematic, long-term
monitoring of HU Aqr is required to interpret the (O-C) residuals. | | Source: | arXiv, 1412.5899 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No message found in this article forum.
You have a question or message about this article?
Ask the community and write a message in the forum.
If you want to rate this article, please use the review section..
To add a message in the forum, you need to login or register first. (free): registration page
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER