From Red Dots: “Proxima Centauri HARPS data release #1”

Red Dots

14th July 2017
Guillem Anglada-Escude

The first spectra obtained by HARPS are now publicly available at https://reddots.space/data/

1
New radial velocity measurements obtained since June 1st 2017 using HARPS. As in the other plot, the blue line is the best fit to a two sinusoid solution. Looks like the signal of Proxima b is holding well (phew!), but more data will be needed to figure out the nature of the second signal.

We planned earlier releases, but weather conditions were not great. So far, we have collected 10 out of 22 possible epochs, which is not a great success rate. The data is organised as follows

Proxima/timeseries

Proxima/spectra

In ‘Proxima/timeseries’, you will find the latest radial velocity measurements and the ‘historical’ data sets used in last year’s paper. They are provided as ‘night’ averages for simplicity. If you have never worked with time-series before, software packages such as Systemic should make your life easier. Check the community tools available here https://reddots.space/toolkit/

The files are regular text (ASCII files) and can be imported to analysis and plotting tools such as Excel, LibreOffice, gnuplot, etc.

The new data is showing interesting features when combined with previous ones. To avoid biasing you and our colleagues, we will refrain ourselves from commenting for now!

3
Radial velocities from Proxima Centauri as obtained by HARPS on 2016 (Pale Red Dot campaign). The blue line is the best fit model to two signals; Proxima b’s one and some longer term variability of (yet) unclear origin.

If you have opinions and/or things you would like to discuss about the time-series and the spectra, please do so in the comments to this post, or via social media (including the @RedDotsSpace (Facebook and/or Twitter) or hashtag #reddots. Photometry and comments on the other stars to follow soon!

4
New radial velocity measurements obtained since June 1st 2017 using HARPS. As in the other plot, the blue line is the best fit to a two sinusoid solution. Looks like the signal of Proxima b is holding well (phew!), but more data will be needed to figure out the nature of the second signal.

See the full article here .

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Red dots is a project to attempt detection of the nearest terrestrial planets to the Sun. Terrestrial planets in temperate orbits around nearby red dwarf stars can be more easily detected using Doppler spectroscopy, hence the name of the project.

ESO 3.6m telescope & HARPS at LaSilla, 600 km north of Santiago de Chile at an altitude of 2400 metres.

ESO/HARPS at La Silla

Centauris Alpha Beta Proxima 27, February 2012. Skatebiker

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