S. Stock

The CARMENES search for exoplanets around M dwarfs. Dynamical characterization of the multiple planet system GJ 1148 and prospects of habitable exomoons around GJ 1148 b

T. Trifonov, M. H. Lee, M. KÃ¼rster +29

Context. GJ 1148 is an M-dwarf star hosting a planetary system composed of two Saturn-mass planets in eccentric orbits with periods of 41.38 and 532.02 days. Aims. We reanalyze the…

An ultra-short-period transiting super-Earth orbiting the M3 dwarf TOI-1685

P. Bluhm, E. Palle, K. Molaverdikhani +51

Dynamical histories of planetary systems, as well as atmospheric evolution of highly irradiated planets, can be studied by characterizing the ultra-short-period planet population,…

The CARMENES search for exoplanets around M dwarfs. Guaranteed time observations Data Release 1 (2016-2020)

I. Ribas, A. Reiners, M. Zechmeister +102

The CARMENES instrument was conceived to deliver high-accuracy radial velocity (RV) measurements with long-term stability to search for temperate rocky planets around a sample of n…

physics.atom-ph2022

Near K-Edge Photoionization and Photoabsorption of Singly, Doubly, and Triply Charged Silicon Ions

S. Schippers, S. Stock, T. Buhr +5

Experimental and theoretical results are presented for double, triple, and quadruple photoionization of Si $^{+}$ and Si $^{2 +}$ ions and for double photoionization of Si $^{3 +}$ ions b…

Probing the atmosphere of WASP-69 b with low- and high-resolution transmission spectroscopy

S. Khalafinejad, K. Molaverdikhani, J. Blecic +31

Consideration of both low- and high-resolution transmission spectroscopy is key for obtaining a comprehensive picture of exoplanet atmospheres. In studies of transmission spectra,…

physics.atom-ph2015

Compton scattering of twisted light: angular distribution and polarization of scattered photons

S. Stock, A. Surzhykov, S. Fritzsche +1

Compton scattering of twisted photons is investigated within a non-relativistic framework using first-order perturbation theory. We formulate the problem in the density matrix theo…

The CARMENES search for exoplanets around M dwarfs. Three temperate to warm super-Earths

S. Stock, E. Nagel, J. Kemmer +37

We announce the discovery of two planets orbiting the M dwarfs GJ 251 ( $0.360 \pm 0.015$ M $_{⊙}$ ) and HD 238090 ( $0.578 \pm 0.021$ M $_{⊙}$ ) based on CARMENES radial velocity (RV) d…

astro-ph.EP2019

A giant exoplanet orbiting a very low-mass star challenges planet formation models

J. C. Morales, A. J. Mustill, I. Ribas +179

Statistical analyses from exoplanet surveys around low-mass stars indicate that super-Earth and Neptune-mass planets are more frequent than gas giants around such stars, in agreeme…

TOI-1801 b: A temperate mini-Neptune around a young M0.5 dwarf

M. MallorquÃn, E. Goffo, E. PallÃ© +79

We report the discovery, mass, and radius determination of TOI-1801 b, a temperate mini-Neptune around a young M dwarf. TOI-1801 b was observed in TESS sectors 22 and 49, and the a…

The CARMENES search for exoplanets around M dwarfs. A sub-Neptunian mass planet in the habitable zone of HN Lib

E. GonzÃ¡lez-Ãlvarez, J. Kemmer, P. Chaturvedi +29

We report the discovery of HN Lib b, a sub-Neptunian mass planet orbiting the nearby ( $d \approx$ = 6.25 pc) M4.0 V star HN Lib detected by our CARMENES radial-velocity (RV) survey…

The CARMENES search for exoplanets around M dwarfs. Two planets on the opposite sides of the radius gap transiting the nearby M dwarf LTT 3780

G. Nowak, R. Luque, H. Parviainen +97

We present the discovery and characterisation of two transiting planets observed by the Transiting Exoplanet Survey Satellite (TESS) orbiting the nearby (d ~ 22 pc), bright (J ~ 9…

A multi-planetary system orbiting the early-M dwarf TOI-1238

E. GonzÃ¡lez-Ãlvarez, M. R. Zapatero Osorio, J. Sanz-Forcada +53

Two transiting planet candidates with super-Earth radii around the nearby K7--M0 dwarf star TOI-1238 were announced by TESS. We aim to validate their planetary nature using precise…

astro-ph.EP2019

The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star

M. Zechmeister, S. Dreizler, I. Ribas +182

Context. Teegarden's Star is the brightest and one of the nearest ultra-cool dwarfs in the solar neighbourhood. For its late spectral type (M7.0V), the star shows relatively little…

astro-ph.EP2022

The CARMENES search for exoplanets around M dwarfs: Stable radial-velocity variations at the rotation period of AD~Leonis -- A test case study of current limitations to treating stellar activity

D. Kossakowski, M. KÃ¼rster, Th. Henning +34

Context: A challenge with radial-velocity (RV) data is disentangling the origin of signals either due to a planetary companion or to stellar activity. In fact, the existence of a p…

A nearby transiting rocky exoplanet that is suitable for atmospheric investigation

T. Trifonov, J. A. Caballero, J. C. Morales +66

Spectroscopy of transiting exoplanets can be used to investigate their atmospheric properties and habitability. Combining radial velocity (RV) and transit data provides additional…

The CARMENES search for exoplanets around M dwarfs. Two terrestrial planets orbiting G 264-012 and one terrestrial planet orbiting Gl 393

P. J. Amado, F. F. Bauer, C. RodrÃguez LÃ³pez +51

We report the discovery of two planetary systems, namely G 264-012, an M4.0 dwarf with two terrestrial planets ( $M_{b} sin i = 2.5 0_{- 0.30}^{+ 0.29}$ M $_{\oplus}$ and $M_{\rm c…

astro-ph.EP2022

The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc

R. Luque, B. J. Fulton, M. Kunimoto +64

We report the discovery of a multi-planetary system transiting the M0 V dwarf HD 260655 (GJ 239, TOI-4599). The system consists of at least two transiting planets, namely HD 260655…

Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)

J. Kemmer, S. Stock, D. Kossakowski +93

We present the confirmation and characterisation of GJ 3473 b (G 50--16, TOI-488.01), a hot Earth-sized planet orbiting an M4 dwarf star, whose transiting signal ($P=1.1980035\pm0.…

The CARMENES search for exoplanets around M dwarfs, Wolf 1069 b: Earth-mass planet in the habitable zone of a nearby, very low-mass star

D. Kossakowski, M. KÃ¼rster, T. Trifonov +47

We present the discovery of an Earth-mass planet ( $M_{b} sin i = 1.26 \pm 0.21 M_{\oplus}$ ) on a 15.6d orbit of a relatively nearby ( $d \sim$ 9.6pc) and low-mass ( $0.167 \pm 0.011 M_{⊙}$ ) M…

TOI-1201 b: A mini-Neptune transiting a bright and moderately young M dwarf

D. Kossakowski, J. Kemmer, P. Bluhm +62

We present the discovery of a transiting mini-Neptune around TOI-1201, a relatively bright and moderately young early M dwarf ( $J \approx$ 9.5 mag, $\sim$ 600-800 Myr) in an equal-m…

The CARMENES search for exoplanets around M dwarfs. Characterization of the nearby ultra-compact multiplanetary system YZ Ceti

S. Stock, J. Kemmer, S. Reffert +38

The nearby ultra-compact multiplanetary system YZ Ceti consists of at least three planets. The orbital period of each planet is the subject of discussion in the literature due to s…

astro-ph.EP2019

Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization

We report the detection of a transiting Earth-size planet around GJ 357, a nearby M2.5V star, using data from the Transiting Exoplanet Survey Satellite (TESS). GJ 357 b (TOI-562.01…

astro-ph.EP2022

Discovery and mass measurement of the hot, transiting, Earth-sized planet GJ 3929 b

J. Kemmer, S. Dreizler, D. Kossakowski +64

We report the discovery of GJ 3929 b, a hot Earth-sized planet orbiting the nearby M3.5 V dwarf star, GJ 3929 (G 180--18, TOI-2013). Joint modelling of photometric observations fro…