Elisa Goffo
A5070179063- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Isotope Analysis in Ecology
- Space Exploration and Technology
- Distributed and Parallel Computing Systems
- Atmospheric Ozone and Climate
- Spacecraft and Cryogenic Technologies
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- High-pressure geophysics and materials
Thüringer Landessternwarte Tautenburg
2021-2024
University of Turin
2020-2024
Abstract We present the mid-infrared (5–12 μ m) phase curve of GJ 367b observed by Mid-Infrared Instrument on James Webb Space Telescope (JWST). is a hot ( T eq = 1370 K), extremely dense (10.2 ± 1.3 g cm −3 ) sub-Earth orbiting an M dwarf 0.32 day orbit. measure eclipse depth 79 4 ppm, nightside planet-to-star flux ratio 8 and relative amplitude 0.97 0.10, all fully consistent with zero-albedo planet no heat recirculation. Such scenario also offset 11°E 5° to within 2.2 σ . The emission...
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...
The system of two transiting Neptune-sized planets around the bright, young M-dwarf AU Mic provides a unique opportunity to test models planet formation, early evolution, and star-planet interaction. However, intense magnetic activity host star makes measuring masses via radial velocity (RV) method very challenging. We report on 1-year, intensive monitoring campaign using 91 observations with HARPS spectrograph, allowing for detailed modelling $\sim 600\, \rm{m\,s^{-1}}$ peak-to-peak...
We present the discovery and characterisation of two transiting planets observed by \textit{TESS} in light curves young bright (V=9.67) star HD73583 (TOI-560). perform an intensive spectroscopic photometric space- ground-based follow-up order to confirm characterise system. found that is a ($\sim 500$~Myr) active with rotational period $12.08 \pm 0.11 $\,d, mass radius $ 0.73 0.02 M_\odot$ $0.65 R_\odot$, respectively. b ($P_b=6.3980420 _{ - 0.0000062 }^{+0.0000067}$ d) has $10.2...
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....
We report the discovery and characterization of two transiting planets around bright M1 V star LP 961-53 (TOI-776, J = 8.5 mag, M 0.54+-0.03 Msun) detected during Sector 10 observations Transiting Exoplanet Survey Satellite (TESS). Combining TESS photometry with HARPS radial velocities, as well ground-based follow-up transit from MEarth LCOGT telescopes, we measured for inner planet, TOI-776 b, a period 8.25 d, radius 1.85+-0.13 Re, mass 4.0+-0.9 Me; outer c, 15.66 2.02+-0.14 5.3+-1.8 Me....
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 ,...
We report the confirmation and mass determination of a mini-Neptune transiting M3.5 V star TOI-4438 (G 182-34) every 7.44 days. A transit signal was detected with NASA’s TESS space mission in sectors 40, 52, 53. In order to validate planet b determine system properties, we combined data high-precision radial velocity measurements from CARMENES spectrograph, spanning almost one year, ground-based photometry. found that has radius R = 2.52 ± 0.13 ⊕ (5% precision), which together M 5.4 1.1 (20%...
HD 191939 (TOI-1339) is a nearby (d=54pc), bright (V=9mag), and inactive Sun-like star (G9 V) known to host multi-planet transiting system. Ground-based spectroscopic observations confirmed the planetary nature of three sub-Neptunes (HD b, c, d) originally detected by TESS were used measure masses for planets b c with 3$\sigma$ precision. These previous also reported discovery an additional Saturn-mass planet e) evidence further, very long-period companion f). Here, we report new...
We report the discovery, mass, and radius determination of TOI-1801 b, a temperate mini-Neptune around young M dwarf. b was observed in TESS sectors 22 49, alert that this planet candidate with period 21.3 days went out April 2020. However, ground-based follow-up observations, including seeing-limited photometry outside transit together precise radial velocity (RV) measurements CARMENES HIRES revealed true is 10.6 days. These observations also allowed us to retrieve mass 5.74 ± 1.46 ⊕ ,...
Abstract π Men hosts a transiting planet detected by the Transiting Exoplanet Survey Satellite space mission and an outer in 5.7 yr orbit discovered radial velocity (RV) surveys. We studied this system using new RV measurements taken with HARPS spectrograph on ESO’s 3.6 m telescope, as well archival data. constrain stellar semiamplitude due to planet, c, K c = 1.21 ± 0.12 s −1 , resulting mass of M 3.63 0.38 ⊕ . A radius R 2.145 0.015 yields bulk density ρ 2.03 0.22 g cm −3 The precisely...
The hot Neptune desert is a region hosting small number of short-period Neptunes in the radius-instellation diagram. Highly irradiated planets are usually either ( R ≲ 2 ⊕ ) and rocky or they gas giants with radii ≳1 J . Here, we report on intermediate-sized planet TOI-2196 b (TIC 372172128.01) 1.2 day orbit around G-type star V = 12.0, [Fe/H] 0.14 dex) discovered by Transiting Exoplanet Survey Satellite sector 27. We collected 41 radial velocity measurements HARPS spectrograph to confirm...
Abstract We report the discovery of two transiting planets around bright ( V = 9.9 mag) main-sequence F7 star TOI-1670 by Transiting Exoplanet Survey Satellite. b is a sub-Neptune <?CDATA ${R}_{{\rm{b}}}={2.06}_{-0.15}^{+0.19}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>R</mml:mi> </mml:mrow> <mml:mi mathvariant="normal">b</mml:mi> </mml:msub> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mn>2.06</mml:mn> <mml:mo>−</mml:mo>...
ABSTRACT We report on the precise radial velocity follow-up of TOI-544 (HD 290498), a bright K star (V = 10.8), which hosts small transiting planet recently discovered by Transiting Exoplanet Survey Satellite (TESS). collected 122 high-resolution High Accuracy Radial Planet Searcher (HARPS) and HARPS-N spectra to spectroscopically confirm measure its mass. The nearly 3-yr baseline our allowed us unveil presence an additional, non-transiting, longer-period companion planet. derived radius...
We report the discovery of TOI-1268b, a transiting Saturn-mass planet from TESS space mission. With an age less than one Gyr, derived various indicators, TOI-1268b is youngest known to date and contributes small sample well characterised young planets. It has orbital period $P\,=\,8.1577080\pm0.0000044$ days, transits early K dwarf star with mass $M_\star$ = $ 0.96 \pm 0.04$ $M_{\odot}$, radius $R_\star$ 0.92 0.06$ $R_{\odot}$, effective temperature $T_\mathrm{eff}\,=\,5300\pm100$ K,...
We used TESS light curves and HARPS-N spectrograph radial velocity measurements to establish the physical properties of transiting exoplanet candidate found around star HD 20329 (TOI-4524). performed a joint fit time series measure mass, radius, orbital parameters candidate. confirm characterize 20329b, an ultra-short-period (USP) planet solar-type star. The host (HD 20329, $V = 8.74$ mag, $J 7.5$ mag) is characterized by its G5 spectral type with $\mathrm{M}_\star= 0.90 \pm 0.05$ M$_\odot$,...
We present the discovery and characterization of two sub-Neptunes in close orbits, as well a tentative outer planet similar size, orbiting TOI-1260 - low metallicity K6V dwarf star. Photometry from TESS yields radii $R_{\rm b} = 2.33 \pm 0.10$ $R_{\oplus}$ c} 2.82 0.15$ $R_{\oplus}$, periods 3.13 7.49 days for TOI-1260b TOI-1260c, respectively. combined data with series ground-based follow-up observations to characterize planetary system. From HARPS-N high-precision radial velocities we...
We present the confirmation and characterization of three hot Jupiters, TOI-1181b, TOI-1516b, TOI-2046b, discovered by TESS space mission. The reported Jupiters have orbital periods between 1.4 2.05 days. masses planets are $1.18\pm0.14$ M$_{\mathrm{J}}$, $3.16\pm0.12$\, 2.30 $\pm 0.28$ for respectively. stellar host TOI-1181b is a F9IV star, whereas TOI-1516b TOI-2046b orbit F main sequence stars. ages first two systems in range 2-5 Gyrs. However, TOI-2046 among few youngest known planetary...
TOI-1055 is a Sun-like star known to host transiting Neptune-sized planet on 17.5-day orbit (TOI-1055 b). Radial velocity (RV) analyses carried out by two independent groups using nearly the same set of HARPS spectra have provided measurements planetary masses that differ $\sim$ 2$\sigma$. Our aim in this work solve inconsistency published significantly extending RV and employing new analysis tool able account correct for stellar activity. further was improve precision radius observing...
In this paper we report the discovery of TOI-220 $b$, a new sub-Neptune detected by Transiting Exoplanet Survey Satellite (TESS) and confirmed radial velocity follow-up observations with HARPS spectrograph. Based on combined analysis TESS transit photometry high precision measurements estimate planetary mass 13.8 $\pm$ 1.0 M$_{Earth}$ radius 3.03 0.15 R$_{Earth}$, implying bulk density 2.73 0.47 $\textrm{g cm}^{-3}$. $b$ orbits relative bright (V=10.4) old (10.1$\pm$1.4 Gyr) K dwarf star...
Context. Despite being a prominent subset of the exoplanet population discovered in past three decades, nature and provenance sub-Neptune-sized planets are still one open questions science. Aims. For orbiting bright stars, precisely measuring orbital planet parameters system is best approach to distinguish between competing theories regarding their formation evolution. Methods. We obtained 69 new radial velocity observations mid-M dwarf G 9-40 with CARMENES instrument measure for first time...
ABSTRACT Ultra-short period planets (USPs) have orbital periods of less than 1 d. Since their masses and radii can be determined to a higher precision long-period planets, they are the preferred targets determine density which constrains composition. The K2-106 system is particularly interesting because it contains two nearly identical masses. One high-density USP, other low-density planet that has an 13 Combining Gaia DR3 results with new ESPRESSO data allows us more precisely before. We...