Large batch of planet candidates, including Lalande 21185

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Large batch of planet candidates, including Lalande 21185

Post by Lazarus on 13th February 2017, 3:51 pm

News release
Paper: Butler et al. (2017) - pdf

Details of 20-year planet survey by the Lick-Carnegie Exoplanet Survey Team, with 60 significant unpublished candidates, including a hot super-Earth candidate at Lalande 21185 (Gliese 411). They come out in favour of the planet interpretation for the candidate Jupiter-analogue at HD 154345. Seems more follow-up will be necessary to fully secure the planet interpretation of the new candidates.
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Re: Large batch of planet candidates, including Lalande 21185

Post by Sirius_Alpha on 13th February 2017, 4:44 pm

Is there a complete list of planets (periods, m sin i, etc) or are they going to make us shove the raw HIRES data into Systemic ourselves Razz?

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Re: Large batch of planet candidates, including Lalande 21185

Post by Lazarus on 13th February 2017, 6:45 pm

Also on the systemic blog: 60,949 Doppler Velocities of 1,624 Stars
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Re: Large batch of planet candidates, including Lalande 21185

Post by Lazarus on 13th February 2017, 7:57 pm

Pity it doesn't mention the astrometric claims for Lalande 21185. Not sure what the dataset has to say about it because Systemic2 is totally unstable for me (I can get it to run but attempting to load a dataset causes an immediate crash).
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Re: Large batch of planet candidates, including Lalande 21185

Post by Led_Zep on 14th February 2017, 5:08 am

Paper on arXiv : https://arxiv.org/abs/1702.03571

A press release : http://news.ucsc.edu/2017/02/hires-data-release.html?ref=recent

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Re: Large batch of planet candidates, including Lalande 21185

Post by Edasich on 14th February 2017, 5:32 am

Listed:

http://exoplanet.eu/catalog/lalande_21185_b/

The Solar Neighborhood gradually unveiled. I also recall of a pair of "old" papers where a very long period candidate planet for 41 Arae binary system and a "water Neptune" orbiting Sigma Draconis were inferred. Epsilon Indi A should have a planetary companion soon to confirmed too.
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Re: Large batch of planet candidates, including Lalande 21185

Post by Lazarus on 17th February 2017, 8:08 pm

Managed to get systemic working, modern stricter gcc did not play nice with a couple of bits of it. (Downloaded version 2.2, then applied these three fixes to get it to compile on Ubuntu 16.10).

I can get Lalande 21185 "b" out of the first part of the data, but the full dataset doesn't return it, I think the outliers toward the end of the dataset screw everything up. There doesn't appear to be anything at the 5.8-year period claimed by Gatewood (1996), so unless the orbit is face-on (the inclination doesn't seem to have been published) I guess Lalande 21185 goes into the long list of disproven astrometric planet claims, again (for the earlier claims for this system, see van de Kamp & Lippincott, 1951 and Lippincott, 1960). There is a long period variation at ~4500 days, maybe a magnetic cycle or something of that nature?
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Re: Large batch of planet candidates, including Lalande 21185

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