Marcelo Aron Fetzner Keniger
A5054035462- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Space Exploration and Technology
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Geological and Geochemical Analysis
- Atmospheric and Environmental Gas Dynamics
- Geology and Paleoclimatology Research
- Calibration and Measurement Techniques
- Gamma-ray bursts and supernovae
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Spectroscopy and Laser Applications
- Radioactive element chemistry and processing
- High-pressure geophysics and materials
University of Warwick
2023-2025
Nordic Optical Telescope
2022
Aarhus University
2022
Measurements of the obliquities in exoplanet systems have revealed certain remarkable architectures, some which are very different from those seen Solar System. Nearly 200 obliquity measurements been obtained based on observations Rossiter-McLaughlin (RM) effect. Here, we report 19 planetary systems, previously led to 17 clear detections RM effect and 2 less secure detections. After adding new tally, used entire collection investigate four issues that arisen literature. Here consider...
ABSTRACT To date, thousands of planets have been discovered, but there are regions the orbital parameter space that still bare. An example is short period and intermediate mass/radius known as ‘Neptunian desert’, where should be easy to find discoveries remain few. This suggests unusual formation evolution processes responsible for residing here. We present discovery TOI-332 b, a planet with an ultra-short 0.78 d sits firmly within desert. It orbits K0 dwarf effective temperature 5251 ± 71...
Abstract The recent discoveries of Neptune-sized ultra-short-period planets (USPs) challenge existing planet formation theories. It is unclear whether these residents the Hot Neptune Desert have similar origins to smaller, rocky USPs, or if this discrete population evidence a different pathway altogether. We report discovery TOI-3261b, an ultrahot with orbital period P = 0.88 day. host star V 13.2 mag, slightly supersolar metallicity ([Fe/H] ≃0.15), inactive K1.5 main-sequence at d 300 pc....
Hot Jupiters generally do not have nearby planet companions, as they may cleared out other planets during their inward migration from more distant orbits. This gives evidence that hot often migrate via high-eccentricity due to dynamical interactions between rather than dynamically cool mechanisms through the protoplanetary disk. Here we further refine unique system of WASP-132 by characterizing mass recently validated 1.0-day period super-Earth WASP-132c (TOI-822.02), interior 7.1-day...
NCORES was a large observing program on the ESO HARPS spectrograph, dedicated to measuring masses of Neptune-like and smaller transiting planets discovered by TESS satellite using radial velocity technique. This paper presents an overview programme, its scientific goals published results, covering 35 in 18 planetary systems. We present spectrally derived stellar characterisation mass constraints for five additional TOIs where observations found only marginally significant signals...
Abstract NCORES was a large observing program on the ESO HARPS spectrograph, dedicated to measuring masses of Neptune-like and smaller transiting planets discovered by TESS satellite using radial velocity technique. This paper presents an overview programme, its scientific goals published results, covering 35 in 18 planetary systems. We present spectrally derived stellar characterisation mass constraints for five additional TOIs where observations found only marginally significant signals...
Abstract In this paper, we present a homogeneous analysis of close-in Neptune planets. To do this, compile sample TESS-observed planets using ranking criterion which takes into account the planet’s period, radius, and visual magnitude its host star. We use archival new HARPS data to ensure every target in has precise radial velocities. This yields total 64 targets, 46 are confirmed 18 show no significant velocity signal. explore mass-radius distribution, planetary density, stellar...
ABSTRACT We report the discovery of two transiting planets detected by Transiting Exoplanet Survey Satellite (TESS), TOI-2374 b and TOI-3071 b, orbiting a K5V an F8V star, respectively, with periods 4.31 1.27 d, respectively. confirm characterize these variety ground-based follow-up observations, including photometry, precise radial velocity monitoring high-resolution imaging. The planetary orbital parameters were derived from joint analysis velocities photometric data. found that have...
Context . The Neptunian desert and savanna have recently been found to be separated by a ridge, an overdensity of planets in the period range ≃3–5 days. These features are thought shaped dynamical atmospheric processes. However, their roles not yet well understood. Aims Our aim was confirm characterize super-Neptune TESS candidate TOI-5005.01, which orbits moderately bright (V = 11.8) solar-type star (G2 V) with orbital 6.3 With these properties, TOI-5005.01 is located near ridge. Methods We...
ABSTRACT We report the discovery of two exoplanets orbiting around HD 212729 (TOI 1052, TIC 317060587), a Teff = 6146 K star with V 9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass transits star, an additional planet TOI-1052c radial velocities but not seen to transit. confirm planetary nature TOI-1052b using precise velocity observations from HARPS determined its parameters joint RV photometry analysis. has radius $2.87^{+0.29}_{-0.24}$ R⊕, mass 16.9 ±...
ABSTRACT There is a great deal of scientific interest in characterizing the basaltic asteroids (spectrally classified as V-types), they are key to understanding planetesimal formation and evolution early Solar system. These have long been recognized parts crusts fully differentiated planetesimals. Thus, their multiplicity, distribution, physical characteristics crucial for providing context constraining theoretical models In this work, we perform spectral analysis with an extended data set...
We present the discovery and confirmation of a transiting hot, bloated Super-Neptune using photometry from TESS LCOGT radial velocity measurements HARPS. The host star TOI-2498 is V = 11.2, G-type (T$_{eff}$ 5905 $\pm$ 12K) solar-like with mass 1.12 0.02 M$_{\odot}$ radius 1.26 0.04 R$_{\odot}$. planet, b, orbits period 3.7 days, has 6.1 0.3 R$_{\oplus}$, 35 4 M$_{\oplus}$. This results in density 0.86 0.25 g cm$^{-3}$. b resides on edge Neptune desert; region mass-period parameter space...
We report the discovery of two transiting planets detected by Transiting Exoplanet Survey Satellite (TESS), TOI-2374 b and TOI-3071 b, orbiting a K5V an F8V star, respectively, with periods 4.31 1.27 days, respectively. confirm characterize these variety ground-based follow-up observations, including photometry, precise radial velocity monitoring high-resolution imaging. The planetary orbital parameters were derived from joint analysis velocities photometric data. found that have masses $(57...
Hot Jupiters generally do not have nearby planet companions, as they may cleared out other planets during their inward migration from more distant orbits. This gives evidence that hot often migrate via high-eccentricity due to dynamical interactions between rather than dynamically cool mechanisms through the protoplanetary disk. Here we further refine unique system of WASP-132 by characterizing mass recently validated 1.0-day period super-Earth WASP-132c (TOI-822.02) interior 7.1-day Jupiter...
Measurements of the obliquities in exoplanet systems have revealed some remarkable architectures, which are very different from Solar System. Nearly 200 obliquity measurements been obtained through observations Rossiter-McLaughlin (RM) effect. Here we report on 19 planetary that led to 17 clear detections RM effect and 2 less secure detections. After adding new tally, use entire collection investigate four issues arisen literature. i) Does distribution show a peak at approximately...
Abstract. Monitoring the abundance of greenhouse gases is necessary to quantify their impact on global warming and climate change. Carbon dioxide (CO2) methane (CH4) are two most important when it comes warming, there many ground-based networks, such as TCCON, satellites, OCO-2, OCO-3 GOSAT-2, that tasked with measuring total column volume mixing ratio (VMR) either one or both these gases. However, networks all rely sunlight carry out measurements. For measurements at night, a technique...
ABSTRACT We report on the detailed characterization of K2-370 b, a transiting sub-Neptune 2.14-d orbit around chromospherically active G-type dwarf HD 284521 ($T_\mathrm{eff} = 5662\pm 44$ K, $\lt \log R^\prime _{\rm HK}\gt =-4.49$). The system parameters are derived based global fit to K2, TESS and CHEOPS photometry, HARPS-N HARPS radial velocities (RVs). A Gaussian process regression analysis is performed simultaneously orbital RVs effectively model strong stellar rotation signal with...
The Neptunian desert and savanna have been recently found to be separated by a ridge, an overdensity of planets in the $\simeq$3-5 days period range. These features are thought shaped dynamical atmospheric processes. However, their relative roles not yet well understood. We intend confirm characterise super-Neptune TESS candidate TOI-5005.01, which orbits moderately bright (V = 11.8) solar-type star (G2 V) with orbital 6.3 days. TOI-5005 b transiting radius $R_{\rm p}$ $6.25\pm 0.24$ $\rm...
TOI-396 is an F6V star ($V\approx6.4$) orbited by three transiting planets. The orbital periods of the two innermost planets are close to 5:3 commensurability ($P_b \sim3.6$ d and $P_c \sim6.0$ d). To measure masses planets, refine their radii, investigate whether b c in MMR, we carried out HARPS RV observations retrieved photometric data from TESS. We extracted RVs via a skew-normal fit onto CCFs performed MCMC joint analysis Doppler measurements transit photometry, while employing...
TOI-396 is an F6\,V bright naked-eye star ($V$\,approx \,6.4) orbited by three small ($R_p$\,approx \,2 $R_ transiting planets discovered thanks to space-based photometry from two sectors. The orbital periods of the innermost planets, namely TOI-396\,b and c, are close 5:3 commensurability ($P_b$\,sim \,3.6\,d $P_c$\,sim \,6.0\,d), suggesting that might be trapped in a mean motion resonance (MMR). To measure masses refine their radii, investigate whether b c MMR, we carried out radial...
We present the discovery and confirmation of a transiting hot, bloated Super-Neptune using photometry from TESS LCOGT radial velocity measurements HARPS. The host star TOI-2498 is V = 11.2, G-type (T$_{eff}$ 5905 $\pm$ 12K) solar-like with mass 1.12 0.02 M$_{\odot}$ radius 1.26 0.04 R$_{\odot}$. planet, b, orbits period 3.7 days, has 6.1 0.3 R$_{\oplus}$, 35 4 M$_{\oplus}$. This results in density 0.86 0.25 g cm$^{-3}$. b resides on edge Neptune desert; region mass-period parameter space...
We report the discovery of two exoplanets orbiting around HD 212729 (TOI\,1052, TIC 317060587), a $T_{\rm eff}=6146$K star with V=9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass transits star, an additional planet TOI-1052c radial velocities but not seen to transit. confirm planetary nature TOI-1052b using precise velocity observations from HARPS determined its parameters joint RV photometry analysis. has radius $2.87^{+0.29}_{-0.24}$ R$_{\oplus}$, mass...