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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We present the discovery and validation of a temperate sub-Neptune around thenearby mid-M dwarf TIC 470381900 (TOI-1696), with a radius of $3.09 \pm 0.11\,R_\oplus$ and an orbital period of $2.5 \,\rm{days}$, using a combination ofTESS and follow-up observations using ground-based telescopes. Joint analysisof multi-band photometry from TESS, MuSCAT, MuSCAT3, Sinistro, and KeplerCamconfirmed the transit signal to be achromatic as well as refined the orbitalephemeris. High-resolution imaging with Gemini/'Alopeke and high-resolutionspectroscopy with the Subaru/IRD confirmed that there are no stellar companionsor background sources to the star. The spectroscopic observations with IRD andIRTF/SpeX were used to determine the stellar parameters, and found the hoststar is an M4 dwarf with an effective temperature of $T_{eff} = 3185 \pm76\,\rm{K}$ and a metallicity of [Fe/H] $=0.336 \pm 0.060 \,\rm{dex}$. Theradial velocities measured from IRD set a $2$-$\sigma$ upper limit on theplanetary mass to be $48.8 \,M_\oplus$. The large radius ratio ($R_p/R_\star\sim 0.1$) and the relatively bright NIR magnitude ($J=12.2 \,\rm{mag}$) makethis planet an attractive target for further followup observations. TOI-1696bis one of the planets belonging to the Neptunian desert with the highesttransmission spectroscopy metric discovered to date, making it an interestingcandidate for atmospheric characterizations with JWST.

TOI-1696: a nearby M4 dwarf with a $3R_\oplus$ planet in the Neptunian desert