New HARPS M dwarf systems - GJ 3138, GJ 3323, GJ 273 (Luyten's Star), GJ 628 (Wolf 1061), and GJ 3293

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New HARPS M dwarf systems - GJ 3138, GJ 3323, GJ 273 (Luyten's Star), GJ 628 (Wolf 1061), and GJ 3293

Post by Sirius_Alpha on 16th March 2017, 11:22 pm

The HARPS search for southern extra-solar planets XLI. A dozen planets around the M dwarfs GJ 3138, GJ 3323, GJ 273, GJ 628, and GJ 3293
https://arxiv.org/abs/1703.05386

Context. Low mass stars are currently the best targets for searches for rocky planets in the habitable zone of their host star. Over the last 13 years, precise radial velocities measured with the HARPS spectrograph have identified over a dozen super-Earths and Earth-mass planets (msin i<10Mearth ) around M dwarfs, with a well understood selection function. This well defined sample informs on their frequency of occurrence and on the distribution of their orbital parameters, and therefore already constrains our understanding of planetary formation. The subset of these low-mass planets that were found within the habitable zone of their host star also provide prized targets for future atmospheric biomarkers searches. Aims. We are working to extend this planetary sample to lower masses and longer periods through dense and long-term monitoring of the radial velocity of a small M dwarf sample. Methods. We obtained large numbers of HARPS spectra for the M dwarfs GJ 3138, GJ 3323, GJ 273, GJ 628 and GJ 3293, from which we derived radial velocities (RVs) and spectroscopic activity indicators. We searched them for variabilities, periodicities, Keplerian modulations and correlations, and attribute the radial-velocity variations to combinations of planetary companions and stellar activity. Results. We detect 12 planets, of which 9 are new with masses ranging from 1.17 to 10.5 Mearth . Those planets have relatively short orbital periods (P<40 d), except two of them with periods of 217.6 and 257.8 days. Among these systems, GJ 273 harbor two planets with masses close to the one of the Earth. With a distance of 3.8 parsec only, GJ 273 is the second nearest known planetary system - after Proxima Centauri - with a planet orbiting the circumstellar habitable zone.

Planets at Wolf 1061 were also reported here. Worth noting the new fit for the period for Wolf 1061 d is much greater than the fit proposed earlier.

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Re: New HARPS M dwarf systems - GJ 3138, GJ 3323, GJ 273 (Luyten's Star), GJ 628 (Wolf 1061), and GJ 3293

Post by Lazarus on 17th March 2017, 4:12 am

Why didn't they give the argument of periastron values for the orbits? It's significant for determining transit probabilities and likely timings.
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Re: New HARPS M dwarf systems - GJ 3138, GJ 3323, GJ 273 (Luyten's Star), GJ 628 (Wolf 1061), and GJ 3293

Post by Daniel on 17th March 2017, 10:36 am

Anyone here knows the distance of GJ 3138? It's been hard to find more details of this star.
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Re: New HARPS M dwarf systems - GJ 3138, GJ 3323, GJ 273 (Luyten's Star), GJ 628 (Wolf 1061), and GJ 3293

Post by Daniel on 17th March 2017, 10:49 am

Now I found it GJ 3138 (HIP 10037) it's at 29.904 parsecs on the constellation of Cetus.

http://server3.sky-map.org/starview?object_type=1&object_id=1454371&object_name=HIP+10037&locale=EN
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Re: New HARPS M dwarf systems - GJ 3138, GJ 3323, GJ 273 (Luyten's Star), GJ 628 (Wolf 1061), and GJ 3293

Post by Led_Zep on 18th March 2017, 12:29 am

For GJ 3293, see also :

http://solar-flux.forumandco.com/t1599-planets-at-gj-3293-and-gj-3341-from-harps

Two Neptune-mass planets - msin(i) = 1:4  0:1 and 1:3  0:1Mnept - orbit GJ 3293 with periods P = 30:60  0:02 d and P = 123:98  0:38 d, possibly together with a super-Earth - msin(i)  7:9  1.4 earth M with period P = 48:14  0:12

Finaly, 4 planets for the system :

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Re: New HARPS M dwarf systems - GJ 3138, GJ 3323, GJ 273 (Luyten's Star), GJ 628 (Wolf 1061), and GJ 3293

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