Amateur Finds

Premiss: the things I'm going to type here SHOULD NOT break any embargo breach since paper has been published and submitted at ArXiv.org too. Moreover they also should not have a scientific significance since based on few data available and most of results come from approximations. Nevertheless what's come out sounds interesting.

Do you remember the paper A Dedicated M Dwarf Planet Search Using The Hobby-Eberly Telescope?

The paper talks about detection efficiency of low mass exoplanets around nearby red dwarfs. Even a more recent one from UVES talks about the same but observing another stock of nearby M dwarfs.

However radial velocity sets are not available in written form, but in graphical one. Employing bitmap, wordpad and a bit of patience, I've extracted vels and sys files for related stellar objects and I've performed a Systemic Console search for planets.
Results are interesting.
Most of the stars show clear signals of short-period bodies in tight orbits and few ones even hints of additional longer period companions.

Among these I notice the very nearby star GJ 687 (or BD+68 946) once suspected to host a massive substellar object in wide and eccentric orbit (>10 Mj e<0.9). Well, the best fit consist in a close-in hot earth and a "low-mass" brown dwarf (or massive superplanet) at 6.17 AUs and e=0.8.

Between survey stars there is Barnard's Star too and, obviously that is the trickiest object. I don't report anything, since neither from HET or UVES paper I've found a convincing fit.

However, briefly I've summarized observed results (Chi Square<<0.1) in graphical form to not type a "fathoms-long" topic.
I have put Sun and Mercury's mutual distances to compare with M-dwarf/planetary objects ones.
Enjoy:





Some planets show relatively mild eccentricity and few others high ones, but most of the objects lies in circular orbit.

Among most interesting cases I underline those of GJ 272 and GJ 671. The former shows two super-earths in close orbits and the latter a low-mass hot Neptune and a GJ 876 c-like dwarf-jovian within system's habitable zone.

Feedback is welcome.

Gives me chi-square close to 0 and jitter = NaN

Even activity must be accounted. I say this little research of mine has few scientific feasibility, but it's a nice speculative work.

However the GJ 687's case is interesting, since seems to not rule out the long period superplanet in eccentric orbit and hints the presence of a super-earth too.

Sedna wrote:

Edasich wrote:Among most interesting cases I underline those of GJ 272 and GJ 671. The former shows two super-earths in close orbits and the latter a low-mass hot Neptune and a GJ 876 c-like dwarf-jovian within system's habitable zone.

Hey Edasich,

What are your parameters for this star ? Because after my calculations, GJ 671 c does not lie in the HZ. Or am I wrong ?

Bye

Sedna

As I've said in another thread, I have used parameters from NsTed database

http://nsted.ipac.caltech.edu/