The CORALIE survey for southern extra-solar planets VII. Two short-period Saturnian companions to HD108147 and HD168746

Abstract

We present the discovery of two Saturn-mass companions to HD108147 and HD168746. Both belong to the lightest ever discovered planets. The minimum mass of the companion to HD168746 is of only 0.77 the mass of Saturn and its orbital period is 6.4 days. The companion to HD108147 orbits its parent star in 10.9 days and its minimum mass is 1.34 that of Saturn. Its orbit is characterized by a high eccentricity, e=0.50, indicating possibly the presence of a second companion. The detection of Saturn-mass planets by means of the Doppler technique demands high radial-velocity measurement precision. The two new candidates were discovered by means of the CORALIE echelle spectrograph. The instrumental accuracy of CORALIE combined with the simultaneous ThAr-reference technique has reached a level better than 3m/s. On many observed objects the precision is now limited by photon noise. We present in this paper the weighted cross-correlation technique, which leads to an improvement in the photon noise of the computed radial velocity. We discuss as well a modification of the numerical cross-correlation mask which reduces significantly the residual perturbation effects produced by telluric absorption lines.

8 pages, A&A in press

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• Near infrared spectroscopic search for the close orbiting planet HD 75289b
• On the Search For Transits of the Planets Orbiting Gl 876
• Doppler search for exoplanet candidates and binaries in a CoRoT field using a multi-fiber spectrograph
• The TOI-763 system: sub-Neptunes orbiting a Sun-like star
• TOI-2196 b: Rare planet in the hot Neptune desert transiting a G-type star
• Spectroscopic and astrometric radial velocities: Hyades as a benchmark
• GIARPS High-resolution Observations of T Tauri stars (GHOsT). I. Jet line emission
• Planets around the evolved stars 24 Booties and $\gamma$ Libra: A 30d-period planet and a double giant-planet system in possible 7:3 MMR
• WASP-147b, 160Bb, 164b and 165b: two hot Saturns and two Jupiters, including two planets with metal-rich hosts
• Tracking Advanced Planetary Systems (TAPAS) with HARPS-N. VI. HD 238914 and TYC 3318-01333-1 - two more Li-rich giants with planets
• Three planets transiting the evolved star EPIC 249893012: a hot 8.8-M${}_{\oplus }$ super-Earth and two warm 14.7 and 10.2-M${}_{\oplus }$ sub-Neptunes
• The Observed Distribution of Spectroscopic Binaries from the Anglo-Australian Planet Search
• The homogeneous characterisation of Ariel host stars
• TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter
• VELOcities of CEpheids (VELOCE) I. High-precision radial velocities of Cepheids
• The GAPS Programme with HARPS-N@TNG VI: The Curious Case of TrES-4b
• TOI-1670 b and c: An Inner Sub-Neptune with an Outer Warm Jupiter Unlikely to have Originated from High-Eccentricity Migration
• Precise radial velocities of giant stars VIII. Testing for the presence of planets with CRIRES Infrared Radial Velocities
• HAT-P-42b and HAT-P-43b. Two Inflated Transiting Hot Jupiters from the HATNet Survey
• Exploring the Brown Dwarf Desert with Precision Radial Velocities and Gaia DR3 Astrometric Orbits
• The SOPHIE search for northern extrasolar planets-XIX. A system including a cold sub-Neptune potentially transiting a V = 6.5 star HD88986
• The young mini-Neptune HD 207496b that is either a naked core or on the verge of becoming one
• TOI-4010: A System of Three Large Short-Period Planets With a Massive Long-Period Companion
• A deeper view of the CoRoT-9 planetary system. A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering
• Probing Polaris' Puzzling Radial Velocity Signals - Pulsational (In-)Stability, Orbital Motion, and Bisector Variations
• Is the activity level of HD 80606 influenced by its eccentric planet?
• Transiting exoplanets from the CoRoT space mission XXVII. CoRoT-28b, a planet orbiting an evolved star, and CoRoT-29b, a planet showing an asymmetric transit
• The Epoch of Giant Planet Migration Planet Search Program. I. Near-Infrared Radial Velocity Jitter of Young Sun-like Stars
• ESPRESSO observations of Gaia BH1: high-precision orbital constraints and no evidence for an inner binary
• The GAPS Programme at TNG: XXXVI. Measurement of the Rossiter-McLaughlin effect and revising the physical and orbital parameters of the HAT-P-15, HAT-P-17, HAT-P-21, HAT-P-26, HAT-P-29 eccentric planetary systems
• HD207897 b: A dense sub-Neptune transiting a nearby and bright K-type star
• A warm super-Neptune around the G-dwarf star TOI-1710 revealed with TESS, SOPHIE and HARPS-N
• The SOPHIE search for northern extrasolar planets - XII. Three giant planets suitable for astrometric mass determination with Gaia
• $\text{GRASS}$: Distinguishing Planet-induced Doppler Signatures from Granulation with a Synthetic Spectra Generator
• The GAPS programme at TNG XLIV. Projected rotational velocities of 273 exoplanet-host stars observed with HARPS-N
• Solar Contamination in Extreme Precision Radial Velocity Measurements: Deleterious Effects and Prospects for Mitigation
• Unsigned magnetic flux proxy from solar optical intensity spectra
• The HARPS search for southern extra-solar planets. XLVI: 12 super-Earths around the solar type stars HD39194, HD93385, HD96700, HD154088, and HD189567
• Using HARPS-N to characterise the long-period planets in the PH-2 and Kepler-103 systems
• WASP-135b: a highly irradiated, inflated hot Jupiter orbiting a G5V star
• Detection and Characterization of Extrasolar Planets through Doppler Spectroscopy
• FIESTA II. Disentangling stellar and instrumental variability from exoplanetary Doppler shifts in Fourier domain
• Hot exoplanetary atmospheres in 3D
• The atmospheric composition of the ultra-hot Jupiter WASP-178 b observed with ESPRESSO
• The HARPS search for southern extra-solar planets XL. Searching for Neptunes around metal-poor stars
• Eclipsing binaries and fast rotators in the Kepler sample. Characterization via radial velocity analysis from Calar Alto
• A 4.6-year period brown-dwarf companion interacting with the hot-Jupiter CoRoT-20 b
• The first radial velocity measurements of a microlensing event: no evidence for the predicted binary
• Rossiter-McLaughlin detection of the 9-month period transiting exoplanet HIP41378 d
• The widest broadband transmission spectrum (0.38-1.71 $\mu$m) of HD 189733b from ground-based chromatic Rossiter-McLaughlin observations
• Discovery of the spectroscopic binary nature of three bright southern Cepheids
• The GAPS Programme with HARPS-N@TNG XII: Characterization of the planetary system around HD108874
• Instrument Simulator and Data Reduction Pipeline for the iLocater Spectrograph
• The death of Vulcan: NEID reveals the planet candidate orbiting HD 26965 is stellar activity
• Improving Earth-like planet detection in radial velocity using deep learning
• The GAPS programme at TNG LX Atmospheric characterisation of KELT-9 b via single-line analysis: Detection of six H I Balmer lines, Na I, Ca I, Ca II, Fe I, Fe II, Mg I, Ti II, Sc II, and Cr II
• Regular Radial Velocity Variations in Nine G- and K-type Giant Stars: Eight Planets and One Planet Candidate
• Multi-Mask Least-Squares Deconvolution: Extracting RVs using tailored masks
• Discovery of the spectroscopic binary nature of six southern Cepheids
• K2-30b and K2-34b: two inflated hot-Jupiters around Solar-type stars
• KPS-1b: the first transiting exoplanet discovered using an amateur astronomer's wide-field CCD data
• On the Fundamental Mass-Period Functions of Extrasolar Planets
• The SOPHIE search for northern extrasolar planets. XVIII: Six new cold Jupiters, including one of the most eccentric exoplanet orbits
• Stellar masks and bisector's shape for M-type stars observed in the GAPS Programme with HARPS-N at TNG
• Radial velocity homogeneous analysis of M dwarfs observed with HARPS I. Exoplanet detection and candidates
• Mass determination of K2-19b and K2-19c from radial velocities and transit timing variations
• Chromatic line-profile tomography to reveal exoplanetary atmospheres: application to HD 189733b
• WASP-157b, a Transiting Hot Jupiter Observed with K2
• The M4 Core Project with HST - IV. Internal Kinematics from Accurate Radial Velocities of 2771 Cluster Members
• Recovering the colour-dependent albedo of exoplanets with high-resolution spectroscopy: from ESPRESSO to the ELT
• The CARMENES search for exoplanets around M dwarfs. Line-by-line sensitivity to activity in M dwarfs
• The Measured Impact of Chromatic Atmospheric Effects on Barycentric Corrections: Results from the EXtreme PREcision Spectrograph
• TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
• Independent discovery and refined parameters of the transiting exoplanet HAT-P-14b
• GRASS II: Simulations of Potential Granulation Noise Mitigation Methods
• XO-7 b: A transiting hot Jupiter with a massive companion on a wide orbit
• Moderately misaligned orbit of the warm sub-Saturn HD 332231 b
• Characterization of seven transiting systems including four warm Jupiters from SOPHIE and TESS
• Tracking Advanced Planetary Systems (TAPAS) with HARPS-N. III. HD 5583 and BD+15 2375 - two cool giants with warm companions
• Precision velocimetry planet hunting with PARAS: Current performance and lessons to inform future extreme precision radial velocity instruments
• The multi-planet system TOI-421 -- A warm Neptune and a super puffy mini-Neptune transiting a G9 V star in a visual binary
• BEBOP VII. SOPHIE discovery of BEBOP-3b, a circumbinary giant planet on an eccentric orbit
• Comparing radial velocities of atmospheric lines with radiosonde measurements
• Characterisation of TOI-406 as showcase of the THIRSTEE program: A 2-planet system straddling the M-dwarf density gap
• A systematic bias in template-based RV extraction algorithms
• Two transiting hot Jupiters from the WASP survey: WASP-150b and WASP-176b
• HD 183579b: A Warm Sub-Neptune Transiting a Solar Twin Detected by TESS
• Identifying Exoplanets with Deep Learning. IV. Removing Stellar Activity Signals from Radial Velocity Measurements Using Neural Networks
• Li-rich giant stars under scrutiny: Binarity, magnetic activity and the evolutionary status after Gaia DR2
• SOPHIE velocimetry of Kepler transit candidates. XIX. The transiting temperate giant planet KOI-3680b
• CoRoT LRa02_E2_0121: Neptune-size planet candidate turns into a hierarchical triple system with a giant primary
• Improved precision of radial velocity measurements after correction for telluric absorption
• Analysis of the public HARPS/ESO spectroscopic archive -- Jupiter-like planets around HD 103891 and HD 105779
• The Effects of Telluric Contamination in Iodine Calibrated Precise Radial Velocities
• SOAPv4: A new step toward modeling stellar signatures in exoplanet research
• A Stellar Activity F-statistic for Exoplanet Surveys (SAFE)
• Correlations between laboratory line lists for FeH, CrH, and NiH and M-star spectra collected with ESPaDOnS and SPIRou
• TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary
• The Radcliffe Wave as traced by young open clusters: Stellar parameters, activity indicators, and abundances of solar-type members of eight young clusters
• Radii, masses, and transit-timing variations of the three-planet system orbiting the naked-eye star TOI-396
• Two neighbours of the ultra-short-period Earth-sized planet K2-157 b in the warm Neptunian savanna
• Tracking Advanced Planetary Systems (TAPAS) with HARPS-N. V.: A Massive Jupiter orbiting the very low metallicity giant star BD+03 2562 and a possible planet around HD~103485
• NIRPS detection of delayed atmospheric escape from the warm and misaligned Saturn-mass exoplanet WASP-69b
• In-depth characterization of the Kepler-10 three-planet system with HARPS-N radial velocities and Kepler transit timing variations
• Precise characterisation of HD 15337 with CHEOPS: a laboratory for planet formation and evolution
• HADES RV programme with HARPS-N at TNG XIV. A candidate super-Earth orbiting the M-dwarf GJ 9689 with a period close to half the stellar rotation period
• On the nature of VX Sagitarii: Is it a TZO, a RSG or a high-mass AGB star?
• Discovery and characterization of a dense sub-Saturn TOI-6651b
• The GAPS programme at TNG XLIII. A massive brown dwarf orbiting the active M dwarf TOI-5375
• The star HIP 41378 potentially misaligned with its cohort of long-period planets
• A differential Least Squares Deconvolution method for high precision spectroscopy of stars and exoplanets I. Application to obliquity measurements of HARPS observations of HD189733b
• Origin theories for the eccentricities of extrasolar planets
• The GAPS Programme at TNG. LXV. Precise density measurement of TOI-1430 b, a young planet with an evaporating atmosphere
• Tracking Advanced Planetary Systems (TAPAS) with HARPS-N VII. Elder suns with low-mass companions
• Confirmation of four hot Jupiters detected by TESS using follow-up spectroscopy from MaHPS at Wendelstein together with NEID and TRES
• Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) VIII. Nondetection of sodium in the atmosphere of the aligned planet KELT-10b
• SAFARI I: A SPHERE discovery of a super metal-rich M dwarf companion to the star HD 86006
• Deriving High-Precision Radial Velocities
• Searching for Low-Mass Exoplanets Amid Stellar Variability with a Fixed Effects Linear Model of Line-by-Line Shape Changes
• Atmospheric composition of WASP-85Ab with ESPRESSO/VLT observations
• A Close-in Planet Orbiting Giant Star HD 167768
• A Trio of Giant Planets Orbiting Evolved Star HD 184010
• The GAPS programme at TNG -- LXIII. Photo-evaporating puzzle: Exploring the enigmatic nature of TOI-5398 b atmospheric signal
• The GAPS Programme at TNG -- XXIII. HD 164922 d: a close-in super-Earth discovered with HARPS-N in a system with a long-period Saturn mass companion
• Characterization of low-mass companions to $\text{Kepler}$ objects of interest observed with APOGEE-N
• Pyodine: An open, flexible reduction software for iodine-calibrated precise radial velocities
• The Interpolation Constraint in the RV Analysis of M-Dwarfs Using Empirical Templates
• Full abundance study of two newly discovered barium giants
• SB 796: a high-velocity RRc star
• TILARA: Template-Independent Line-by-line Algorithm for Radial velocity Analysis. I. Description of the code and application on a Sun-like star
• A transiting rocky super-Earth and a non-transiting sub-Neptune orbiting the M dwarf TOI-771
• The VELOCE modulation zoo II. Humps and splitting patterns in spectral lines of classical Cepheids
• Studying the variability of the He triplet to understand the detection limits of evaporating exoplanet atmospheres
• The California Legacy Survey I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades
• The GAPS programme at TNG LXXI. A sub-Neptune suitable for atmospheric characterization in a multiplanet and mutually inclined system orbiting the bright K dwarf TOI-5789 (HIP 99452)
• Search for giant planets in M67 V: a warm Jupiter orbiting the turn-off star S1429
• The multi-planet system TOI-5624: Four transiting sub-Neptunes with an outer companion revealed by transit-timing variations
• HARPS-N Reveals a Well-aligned Orbit for the Highly Eccentric Warm Jupiter TOI-4127 b
• The VELOCE modulation zoo III. Detecting additional pulsation modes in optical spectra of classical Cepheids using semi-partial distance correlation periodograms
• Time-resolved p-mode oscillations for subgiant HD 142091 with NEID at WIYN
• ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791
• A new third planet and the dynamical architecture of the HD33142 planetary system
• Radial velocities: direct application of Pierre Connes' shift finding algorithm to Cross-Correlation Functions
• Modelling solar radial velocities and photometric variability with SOAPv4
• BEBOP II: Sensitivity to sub-Saturn circumbinary planets using radial-velocities
• Granulation on a quiet K dwarf: HD 166620 I. Spectral signatures as a function of line-formation temperature
• TOI-7154b: A Close-in Massive Brown Dwarf in an Eccentric Orbit
• Discovery of a young low-mass brown dwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey