English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report the discovery of two exoplanets around the M dwarfs GJ 724 and GJ3988 using the radial velocity (RV) method. We obtained a total of 153 3.5 mCalar Alto/CARMENES spectra for both targets and measured their RVs andactivity indicators. We also added archival ESO/HARPS data for GJ 724 andinfrared RV measurements from Subaru/IRD for GJ 3988. We searched for periodicand stable signals to subsequently construct Keplerian models, consideringdifferent numbers of planets, and we selected the best models based on theirBayesian evidence. Gaussian process (GP) regression was included in some modelsto account for activity signals. For both systems, the best model correspondsto one single planet. The minimum masses are $10.75^{+0.96}_{-0.87}$ and$3.69^{+0.42}_{-0.41}$ Earth-masses for GJ 724 b and GJ 3988 b, respectively.Both planets have short periods (P < 10 d) and, therefore, they orbit theirstar closely (a < 0.05 au). GJ 724 b has an eccentric orbit (e =$0.577^{+0.055}_{-0.052}$), whereas the orbit of GJ 3988 b is circular. Thehigh eccentricity of GJ 724 b makes it the most eccentric single exoplanet (tothis date) around an M dwarf. Thus, we suggest a further analysis to understandits configuration in the context of planetary formation and architecture. Incontrast, GJ 3988 b is an example of a common type of planet around mid-Mdwarfs.

Planetary companions orbiting the M dwarfs GJ 724 and GJ 3988. A CARMENES and IRD collaboration