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 and characterization of TOI-1759~b, a temperate (400K) sub-Neptune-sized exoplanet orbiting the M~dwarf TOI-1759 (TIC 408636441).TOI-1759 b was observed by TESS to transit on sectors 16, 17 and 24, with onlyone transit observed per sector, creating an ambiguity on the orbital period ofthe planet candidate. Ground-based photometric observations, combined withradial-velocity measurements obtained with the CARMENES spectrograph, confirman actual period of $18.85019 \pm 0.00014$ d. A joint analysis of all availablephotometry and radial velocities reveal a radius of $3.17 \pm 0.10\,R_\oplus$and a mass of $10.8 \pm 1.5\,M_\oplus$. Combining this with the stellarproperties derived for TOI-1759 ($R_\star = 0.597 \pm 0.015\,R_\odot$; $M_\star= 0.606 \pm 0.020\,M_\odot$; $T_{\textrm{eff}} = 4065 \pm 51$ K), we compute atransmission spectroscopic metric (TSM) value of over 80 for the planet, makingit a good target for transmission spectroscopy studies. TOI-1759 b is among thetop five temperate, small exoplanets ($T_\textrm{eq} < 500$ K, $R_p < 4\,R_\oplus$) with the highest TSM discovered to date. Two additional signalswith periods of 80 d and $>$ 200 d seem to be present in our radial velocities.While our data suggest both could arise from stellar activity, the latersignal's source and periodicity are hard to pinpoint given the $\sim 200$ dbaseline of our radial-velocity campaign with CARMENES. Longer baselineradial-velocity campaigns should be performed in order to unveil the truenature of this long period signal.

A transiting, temperate mini-Neptune orbiting the M dwarf TOI-1759 unveiled by TESS