Search Publications
TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary
Bouchy, F.; Stassun, K.; Winn, J. N. +31 more
We report the discovery of a hot Jupiter on a 3.28-day orbit around a 1.08 M⊙ G0 star that is the secondary component in a loose binary system. Based on follow-up radial velocity observations of TOI-858 B with CORALIE on the Swiss 1.2 m telescope and CHIRON on the 1.5 m telescope at the Cerro Tololo Inter-American Observatory (CTIO), we…
NuSTAR and XMM-Newton observations of the binary 4FGL J1405.1-6119. A γ-ray-emitting microquasar?
Fogantini, Federico A.; Combi, Jorge A.; Romero, Gustavo E. +3 more
Context. 4FGL J1405.1−6119 is a high-mass γ-ray-emitting binary that has been studied at several wavelengths. The nature of this type of binary is still under debate, with three possible scenarios usually invoked to explain the origin of the γ-ray emission: collisions between the winds of a rapidly rotating neutron star and its companion, collisio…
The CARMENES search for exoplanets around M dwarfs. A sub-Neptunian mass planet in the habitable zone of HN Lib
Amado, P. J.; Caballero, J. A.; Pallé, E. +29 more
We report the discovery of HN Lib b, a sub-Neptunian mass planet orbiting the nearby (d ≈ = 6.25 pc) M4.0 V star HN Lib detected by our CARMENES radial-velocity (RV) survey. We determined a planetary minimum mass of Mb sin i = 5.46 ± 0.75 M⊕ and an orbital period of Pb = 36.116 ± 0.029 d, using ~5 yr of CARMENES da…
Reconciling results of 2019 and 2020 stellar occultations on Pluto's atmosphere. New constraints from both the 5 September 2019 event and consistency analysis
Fu, Yanning; Yuan, Ye; Chen, Jian +14 more
A stellar occultation by Pluto on 5 September 2019 yielded positive detections at two separate stations. Using an approach consistent with comparable studies, we derived a surface pressure of 11.478 ± 0.55 µbar for Pluto's atmosphere from the observations of this event. In addition, to avoid potential method inconsistencies when comparing with his…
Spectrum of the secondary component and new orbital elements of the massive triple star δ Ori A
Wade, G. A.; Lovekin, C. C.; Harmanec, P. +13 more
δ Orionis is the closest massive multiple stellar system and one of the brightest members of the Orion OB association. The primary (Aa1) is a unique evolved O star. In this work, we applied a two-step disentangling method to a series of spectra in the blue region (430-450 nm), and we detected spectral lines of the secondary (Aa2). For the first ti…
Particle monitoring capability of the Solar Orbiter Metis coronagraph through the increasing phase of solar cycle 25
Gissot, S.; Sasso, C.; Romoli, M. +26 more
Context. Galactic cosmic rays (GCRs) and solar particles with energies greater than tens of MeV penetrate spacecraft and instruments hosted aboard space missions. The Solar Orbiter Metis coronagraph is aimed at observing the solar corona in both visible (VL) and ultraviolet (UV) light. Particle tracks are observed in the Metis images of the corona…
Extended main-sequence turnoff and red clump in intermediate-age star clusters: A study of NGC 419
Dalessandro, E.; Massari, D.; Ferraro, F. R. +4 more
With the goal of untangling the origin of extended main-sequence turnoffs (eMSTOs) and extended red clumps (eRCs) in star clusters, in this work we present the study of the intermediate-age cluster NGC 419, situated along the Bridge of the Small Magellanic Cloud. To this aim, we analyzed multi-epoch, high angular resolution observations acquired w…
Morphology of the gas-rich debris disk around HD 121617 with SPHERE observations in polarized light
Kral, Quentin; Pinte, Christophe; Olofsson, Johan +7 more
Context. Debris disks are the signposts of collisionally eroding planetesimal circumstellar belts, whose study can put important constraints on the structure of extrasolar planetary systems. The best constraints on the morphology of such disks are often obtained from spatially resolved observations in scattered light. In this paper, we investigate…
The first gradual solar energetic particle event with an enhanced 3He abundance on Solar Orbiter
Lario, D.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +16 more
The origin of 3He abundance enhancements in gradual solar energetic particle (SEP) events remains largely unexplained. Two mechanisms have been suggested: the reacceleration of remnant flare material by coronal mass ejection (CME)-driven shocks in interplanetary space, and concomitant activity in the corona. We explore the first gradual…
The ratio of horizontal to vertical displacement in solar oscillations estimated from combined SO/PHI and SDO/HMI observations
Schmidt, W.; Woch, J.; Solanki, S. K. +44 more
In order to make accurate inferences about the solar interior using helioseismology, it is essential to understand all the relevant physical effects on the observations. One effect to understand is the (complex-valued) ratio of the horizontal to vertical displacement of the p- and f-modes at the height at which they are observed. Unfortunately, it…