Szilárd Csizmadia
A5070482841- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Gamma-ray bursts and supernovae
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Spacecraft and Cryogenic Technologies
- Transportation Planning and Optimization
- Astronomical and nuclear sciences
- Solar and Space Plasma Dynamics
- High-pressure geophysics and materials
- Scientific Research and Discoveries
- Inertial Sensor and Navigation
- Space Exploration and Technology
- Radio Astronomy Observations and Technology
- Semantic Web and Ontologies
- Statistical and numerical algorithms
- Transportation and Mobility Innovations
- Advanced Frequency and Time Standards
- Geomagnetism and Paleomagnetism Studies
- Astrophysical Phenomena and Observations
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2014-2024
Planet
2023
Széchenyi István University
2015
Konkoly Observatory
2004-2008
Hungarian Academy of Sciences
2005-2008
Eötvös Loránd University
2008
We describe the Next Generation Transit Survey (NGTS), which is a ground-based project searching for transiting exoplanets orbiting bright stars. NGTS builds on legacy of previous surveys, most notably WASP, and designed to achieve higher photometric precision hence find smaller planets than have previously been detected from ground. It also operates in red light, maximizing sensitivity late K early M dwarf The survey specifications call 0.1 per cent light over an instantaneous field view...
We present the discovery of NGTS-1b, a hot-Jupiter transiting an early M-dwarf host ($T_{eff}=3916^{+71}_{-63}~K$) in P=2.674d orbit discovered as part Next Generation Transit Survey (NGTS). The planet has mass $0.812^{+0.066}_{-0.075}~M_{J}$, making it most massive ever M-dwarf. radius is $1.33^{+0.61}_{-0.33}~R_{J}$. Since transit grazing, we determine this by modelling data and placing prior on density from population known gas giant planets. NGTS-1b third found around M-dwarf,...
We report on precise Doppler measurements of L231-32 (TOI-270), a nearby M dwarf ($d=22$ pc, $M_\star = 0.39$ M$_\odot$, $R_\star 0.38$ R$_\odot$), which hosts three transiting planets that were recently discovered using data from the Transiting Exoplanet Survey Satellite (TESS). The are 1.2, 2.4, and 2.1 times size Earth have orbital periods 3.4, 5.7, 11.4 days. obtained 29 high-resolution optical spectra with newly commissioned Echelle Spectrograph for Rocky Stable Spectroscopic...
We report the discovery and characterisation of a pair sub-Neptunes transiting bright K-dwarf TOI-1064 (TIC 79748331), initially detected in TESS photometry. To characterise system, we performed retrieved CHEOPS, TESS, ground-based photometry, HARPS high-resolution spectroscopy, Gemini speckle imaging. host star determine $T_{\rm eff, \star}=4734\pm67$ K, $R_{\star}=0.726\pm0.007$ $R_{\odot}$, $M_{\star}=0.748\pm0.032$ $M_{\odot}$. present novel detrending method based on PSF shape-change...
HD3167 is a bright (V=8.9 mag) K0V star observed by the NASA's K2 space mission during its Campaign 8. It has been recently found to host two small transiting planets, namely, HD3167b, an ultra short period (0.96 d) super-Earth, and HD3167c, mini-Neptune on relatively long-period orbit (29.85 d). Here we present intensive radial velocity follow-up of performed with FIES@NOT, HARPS@ESO-3.6m, HARPS-N@TNG spectrographs. We revise system parameters determine radii, masses, densities planets...
We announce the discovery of a planetary system with 7 transiting planets around Kepler target, current record for systems. Planets b, c, e and f are reported first time in this work. d, g h were previously literature (Batalha et al. 2013), although here we revise their orbital parameters validate nature. gas giants show strong dynamical interactions. The orbit planet is perturbed such way that its period changes by 25.7h between two consecutive transits during length observations, which...
We report the discovery of NGTS-4b, a sub-Neptune-sized planet transiting 13th magnitude K-dwarf in 1.34d orbit. NGTS-4b has mass M=$20.6\pm3.0$M_E and radius R=$3.18\pm0.26$R_E, which places it well within so-called "Neptunian Desert". The mean density ($3.45\pm0.95$g/cm^3) is consistent with composition 100% H$_2$O or rocky core volatile envelope. likely to suffer significant loss due relatively strong EUV/X-ray irradiation. Its survival Neptunian desert may be an unusually high mass, have...
We present 44 validated planets from the 10$^\mathrm{th}$ observing campaign of NASA $K2$ mission, as well high resolution spectroscopy and speckle imaging follow-up observations. These come an initial set 72 vetted candidates, which we subjected to a validation process incorporating pixel-level analyses, light curve observational constraints, statistical false positive probabilities. Our planet sample has median values $R_p$ = 2.2 $R_\oplus$, $P_\mathrm{orb}$ 6.9 days, $T_{\mathrm{eq}}$ 890...
Ultra-short-period (USP) exoplanets have orbital periods shorter than one day. Precise masses and radii of USPs could provide constraints on their unknown formation evolution processes. We report the detection characterization USP planet GJ 367b using high precision photometry radial velocity observations. orbits a bright (V-band magnitude = 10.2), nearby, red (M-type) dwarf star every 7.7 hours. has radius $0.718 \pm 0.054$ Earth-radii, mass $0.546 0.078$ Earth-masses, making it sub-Earth....
ABSTRACT HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R⊕ (HIP b) and 3.343 0.039 c). While 20.77291 d period b was measured unambiguously, c showed only transits separated by 680-d gap in time series, leaving many possibilities for period. To solve this issue, CHEOPS performed targeted aliases attempt recover true planet c, successfully determined be 52.56349 d....
We present the discovery of three small planets transiting K2-136 (LP 358 348, EPIC 247589423), a late K dwarf in Hyades. The have orbital periods $7.9757 \pm 0.0011$, $17.30681^{+0.00034}_{-0.00036}$, and $25.5715^{+0.0038}_{-0.0040}$ days, radii $1.05 0.16$, $3.14 0.36$, $1.55^{+0.24}_{-0.21}$ $R_\oplus$, respectively. With an age 600-800 Myr, these are some smallest youngest known. Due to relatively bright (J=9.1) host star, compelling targets for future characterization via radial...
Abstract We present the detection and follow-up observations of planetary candidates around low-mass stars observed by K2 mission. Based on light-curve analysis, adaptive-optics imaging, optical spectroscopy at low high resolution (including radial velocity measurements), we validate 16 planets 12 during campaigns 5–10. Among planets, are newly validated, with orbital periods ranging from 0.96 to 33 days. For one (K2-151b), ground-based transit photometry, allowing us refine ephemerides....
Abstract GJ 367 is a bright ( V ≈ 10.2) M1 star that has been recently found to host transiting ultra-short period sub-Earth on 7.7 hr orbit. With the aim of improving planetary mass and radius unveiling inner architecture system, we performed an intensive radial velocity follow-up campaign with HARPS spectrograph—collecting 371 high-precision measurements over baseline nearly 3 yr—and combined our Doppler new TESS observations from sectors 35 36. We b M = 0.633 ± 0.050 ⊕ R 0.699 0.024 ,...
Context. Recent developments in exoplanetary research highlight the importance of Love numbers understanding their internal dynamics, formation, migration history and potential habitability. represent crucial parameters that gauge how exoplanets respond to external forces such as tidal interactions rotational effects. By measuring these responses, we can gain insights into structure, composition, density distribution exoplanets. The rate apsidal precession a planetary orbit is directly...
Abstract We present the detection of a peculiar high-frequency noise component in 20 s cadence Simple Aperture Photometry light curve Transiting Exoplanets Survey Satellite. This effect (labeled as blue noise) may be attributed to pointing instability (also known satellite jitter) satellite. common technique used mitigation jitter, by decorrelating against subpixel position photo-center point-spread function star. also show that simple linear or polynomial not yield satisfactory corrections,...
We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, radius. analyzed two complementary data sets: photometric transit curve CoRoT-8b as measured by CoRoT radial velocity CoRoT-8 HARPS spectrometer. find is on circular orbit with semi-major axis 0.063 +/- 0.001 AU. It has radius 0.57 0.02 RJ, mass 0.22 0.03 MJ, therefore mean density 1.6 0.1 g/cm^3. With 67 % size Saturn 72 comparable to...
ABSTRACT We report the discovery of K2-98b (EPIC 211391664b), a transiting Neptune-size planet monitored by K2 mission during its Campaign 5. combine time-series data with ground-based photometric and spectroscopic follow-up observations to confirm planetary nature object derive mass, radius, orbital parameters. is warm Neptune-like in 10 day orbit around V = 12.2 mag F-type star M ⋆ 1.074 ± 0.042 ⊙ , R <?CDATA ${1.311}_{-0.048}^{+0.083}$?> age ${5.2}_{-1.0}^{+1.2}\,\mathrm{Gyr}$?> . mass...
We confirm the planetary nature of two transiting hot Jupiters discovered by Kepler spacecraft's K2 extended mission in its Campaign 4, using precise radial velocity measurements from FIES@NOT, HARPS-N@TNG, and coud\'e spectrograph on McDonald Observatory 2.7 m telescope. K2-29 b (EPIC 211089792 b) transits a K1V star with period $3.2589263\pm0.0000015$ days; orbit is slightly eccentric ($e=0.084_{-0.023}^{+0.032}$). It has radius $R_P=1.000_{-0.067}^{+0.071}$ $R_J$ mass...