Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · 2208.07328

TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf

Faith Hawthorn·Daniel Bayliss·Thomas G. Wilson·Andrea Bonfanti·Vardan Adibekyan·Yann Alibert·Sérgio G. Sousa·Karen A. Collins·Edward M. Bryant·Ares Osborn·David J. Armstrong·Lyu Abe·Jack S. Acton·Brett C. Addison·Karim Agabi·Roi Alonso·Douglas R. Alves·Guillem Anglada-Escudé·Tamas Bárczy·Thomas Barclay·David Barrado·Susana C. C. Barros·Wolfgang Baumjohann·Philippe Bendjoya·Willy Benz·Allyson Bieryla·Xavier Bonfils·François Bouchy·Alexis Brandeker·Christopher Broeg·David J. A. Brown·Matthew R. Burleigh·Marco Buttu·Juan Cabrera·Douglas A. Caldwell·Sarah L. Casewell·David Charbonneau·Sébastian Charnoz·Ryan Cloutier·Andrew Collier Cameron·Kevin I. Collins·Dennis M. Conti·Nicolas Crouzet·Szilárd Czismadia·Melvyn B. Davies·Magali Deleuil·Elisa Delgado-Mena·Laetitia Delrez·Olivier D. S. Demangeon·Brice-Olivier Demory·Georgina Dransfield·Xavier Dumusque·Jo Ann Egger·David Ehrenreich·Philipp Eigmüller·Anders Erickson·Zahra Essack·Andrea Fortier·Luca Fossati·Malcolm Fridlund·Maximilian N. Günther·Manuel Güdel·Davide Gandolfi·Harvey Gillard·Michaël Gillon·Crystal Gnilka·Michael R. Goad·Robert F. Goeke·Tristan Guillot·Andreas Hadjigeorghiou·Coel Hellier·Beth A. Henderson·Kevin Heng·Matthew J. Hooton·Keith Horne·Steve B. Howell·Sergio Hoyer·Jonathan M. Irwin·James S. Jenkins·Jon M. Jenkins·Eric L. N. Jensen·Stephen R. Kane·Alicia Kendall·John F. Kielkopf·Laszlo L. Kiss·Gaia Lacedelli·Jacques Laskar·David W. Latham·Alain Lecavalier des Etangs·Adrien Leleu·Monika Lendl·Jorge Lillo-Box·Christophe Lovis·Djamel Mékarnia·Bob Massey·Tamzin Masters·Pierre F. L. Maxted·Valerio Nascimbeni·Louise D. Nielsen·Sean M. O'Brien
View original source ↗Read source document ↗Export metadata ↓

Abstract

We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright ($T = 8.5$ mag), high proper motion ($\sim\,200$ mas yr$^{-1}$), low metallicity ([Fe/H]$\approx\,-0.28$) K-dwarf with a mass of $0.68\pm0.05$ M$_{\odot}$ and a radius of $0.67\pm0.01$ R$_{\odot}$. We obtain photometric follow-up observations with a variety of facilities, and we use these data-sets to determine that the inner planet, TOI-836 b, is a $1.70\pm0.07$ R$_{\oplus}$ super-Earth in a 3.82 day orbit, placing it directly within the so-called 'radius valley'. The outer planet, TOI-836 c, is a $2.59\pm0.09$ R$_{\oplus}$ mini-Neptune in an 8.60 day orbit. Radial velocity measurements reveal that TOI-836 b has a mass of $4.5\pm0.9$ M$_{\oplus}$ , while TOI-836 c has a mass of $9.6\pm2.6$ M$_{\oplus}$. Photometric observations show Transit Timing Variations (TTVs) on the order of 20 minutes for TOI-836 c, although there are no detectable TTVs for TOI-836 b. The TTVs of planet TOI-836 c may be caused by an undetected exterior planet.

Explore related subjects

astro-ph.EP

Keep this discovery

BibTeXRIS

Faith Hawthorn, Daniel Bayliss, Thomas G. Wilson, Andrea Bonfanti, Vardan Adibekyan, Yann Alibert, Sérgio G. Sousa, Karen A. Collins, Edward M. Bryant, Ares Osborn, David J. Armstrong, Lyu Abe, Jack S. Acton, Brett C. Addison, Karim Agabi, Roi Alonso, Douglas R. Alves, Guillem Anglada-Escudé, Tamas Bárczy, Thomas Barclay, David Barrado, Susana C. C. Barros, Wolfgang Baumjohann, Philippe Bendjoya, Willy Benz, Allyson Bieryla, Xavier Bonfils, François Bouchy, Alexis Brandeker, Christopher Broeg, David J. A. Brown, Matthew R. Burleigh, Marco Buttu, Juan Cabrera, Douglas A. Caldwell, Sarah L. Casewell, David Charbonneau, Sébastian Charnoz, Ryan Cloutier, Andrew Collier Cameron, Kevin I. Collins, Dennis M. Conti, Nicolas Crouzet, Szilárd Czismadia, Melvyn B. Davies, Magali Deleuil, Elisa Delgado-Mena, Laetitia Delrez, Olivier D. S. Demangeon, Brice-Olivier Demory, Georgina Dransfield, Xavier Dumusque, Jo Ann Egger, David Ehrenreich, Philipp Eigmüller, Anders Erickson, Zahra Essack, Andrea Fortier, Luca Fossati, Malcolm Fridlund, Maximilian N. Günther, Manuel Güdel, Davide Gandolfi, Harvey Gillard, Michaël Gillon, Crystal Gnilka, Michael R. Goad, Robert F. Goeke, Tristan Guillot, Andreas Hadjigeorghiou, Coel Hellier, Beth A. Henderson, Kevin Heng, Matthew J. Hooton, Keith Horne, Steve B. Howell, Sergio Hoyer, Jonathan M. Irwin, James S. Jenkins, Jon M. Jenkins, Eric L. N. Jensen, Stephen R. Kane, Alicia Kendall, John F. Kielkopf, Laszlo L. Kiss, Gaia Lacedelli, Jacques Laskar, David W. Latham, Alain Lecavalier des Etangs, Adrien Leleu, Monika Lendl, Jorge Lillo-Box, Christophe Lovis, Djamel Mékarnia, Bob Massey, Tamzin Masters, Pierre F. L. Maxted, Valerio Nascimbeni, Louise D. Nielsen, Sean M. O'Brien. 2022-08-15. TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf. https://doi.org/10.1093/mnras%2Fstad306

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Planetary Accretion Is Less Frequent in Wide Binaries: Evidence from Metal-Enriched White Dwarfs in DESI DR1

Binary stars are common in the Galaxy, and understanding how stellar binarity influences the formation and evolution of planetary systems is an active area of research. In this study, we use metal-enriched white dwarfs in wide binaries as tracers of long-lived planetary systems. With Data Release 1 from the Dark Energy Spectroscopic Instrument (DESI), we find that the fraction of cool metal-enriched white dwarfs in wide binaries is 9.8\,$\pm$\,2.1\%, significantly lower (4.7\,$\sigma$) than the 20.5\,$\pm$\,0.9\% in a control sample of single systems. Furthermore, we identify a tentative dependence of metal enrichment on projected separation and white dwarf effective temperature, where enrichment fraction decreases at smaller separations and lower temperatures. These findings indicate that, compared to single stars, binary systems either start with smaller initial planetary reservoirs due to suppressed planetesimal formation or undergo more rapid depletion of planetary material during the initial part of the white dwarf stage.

astro-ph.EP↗
arXiv2026

The Mysterious Inspiral of WASP-12b: Why Obliquity Tides Cannot Drive Orbital Decay

WASP-12b's orbit is decaying, for unknown reasons. The planet's period is shrinking more rapidly than can be attributed to equilibrium tides or dynamical tides in a main-sequence star. Planetary obliquity tides could be sufficiently dissipative to drive WASP-12b's inspiral, but would also damp the planet's obliquity, halting the decay. Millholland & Laughlin proposed that a nearby, low-mass planet ($\sim 10$ M$_\oplus$) is maintaining a large obliquity for WASP-12b, sustaining the dissipation. We re-evaluated this hypothesis, finding that the companion must be more massive than originally proposed ($\gtrsim 65$ M$_\oplus$) to absorb WASP-12b's orbital angular momentum. Radial velocity data allowed us to rule out a companion of this type. Any companions within $3$ AU have $K \lesssim 14$ m/s at $95$% confidence.

astro-ph.EP↗
arXiv2026

Lava Tube Exploration with LunarLeaper

Lunar pits, some of which are interpreted as collapse features into underlying lava tubes, expose otherwise inaccessible stratigraphy and may provide entry points to subsurface voids that preserve records of lunar volcanism and offer potential sites for future human exploration. We synthesize the current state of knowledge on lunar pits and lava tubes, covering their morphological characteristics, classification, proposed formation mechanisms, mechanical stability, and detection from orbit. We then review the open science questions that pit and pit-wall investigation is uniquely placed to address, spanning the volcanic stratigraphy of the lunar maria, the structure and lateral variability of the regolith, and the dimensions and accessibility of subsurface conduits. To evaluate how these questions can be tackled in situ, we assess the feasibility and expected performance of geophysical and remote-sensing investigations for subsurface voids and surface exposures, mainly focusing on gravity measurements, ground-penetrating radar, high-resolution imaging, and spectroscopy. Building on this, we present LunarLeaper, a small legged robot mission concept combining a gravimeter, ground-penetrating radar, high-resolution imager, spectrometer, and leg-based geomechanical experiments to deliver the first in situ investigation of a mare pit. The concept targets the Marius Hills Pit and its associated rille, with a mobility architecture optimized for the rugged terrain encountered at pit edges and funnel slopes.

astro-ph.EP↗