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34 papers · 2 filters
HCN ice in Titan's high-altitude southern polar cloud
Remco J. de Kok, Nicholas A. Teanby, Luca Maltagliati +2
Titan's middle atmosphere is currently experiencing a rapid change of season after northern spring arrived in 2009. A large cloud was observed for the first time above Titan's sout…
New insights on Saturn's formation from its nitrogen isotopic composition
Olivier Mousis, Jonathan I. Lunine, Leigh N. Fletcher +4
The recent derivation of a lower limit for the N/N ratio in Saturn's ammonia, which is found to be consistent with the Jovian value, prompted us to revise models of S…
Scaling laws to understand tidal dissipation in fluid planetary layers and stars
P. Auclair-Desrotour, S. Mathis, C. Le Poncin-Lafitte
Tidal dissipation is known as one of the main drivers of the secular evolution of planetary systems. It directly results from dissipative mechanisms that occur in planets and stars…
Performance of the VLT Planet Finder SPHERE I. Photometry and astrometry precision with IRDIS and IFS in laboratory
A. Zurlo, A. Vigan, D. Mesa +26
The new planet finder for the Very Large Telescope (VLT), the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE), just had its first light in Paranal. A dedicated instr…
The surface signature of the tidal dissipation of the core in a two-layer planet
F. Remus, S. Mathis, J. -P. Zahn +1
Tidal dissipation, which is directly linked to internal structure, is one of the key physical mechanisms that drive systems evolution and govern their architecture. A robust evalua…
Signatures of massive collisions in debris discs
Quentin Kral, Philippe Thebault, Jean-Charles Augereau +2
Violent stochastic collisional events have been invoked as a possible explanation for some debris discs displaying pronounced asymmetries or having a great luminosity excess. So fa…
A ring system detected around the Centaur (10199) Chariklo
F. Braga-Ribas, B. Sicardy, J. L. Ortiz +61
Until now, rings have been detected in the Solar System exclusively around the four giant planets. Here we report the discovery of the first minor-body ring system around the Centa…
Is the HD 15115 inner disk really asymmetrical ?
J. Mazoyer, A. Boccaletti, J. -C. Augereau +3
Context. Debris disks are intrinsically connected to the planetary system's formation and evolution. The development of high-contrast imaging techniques in the past 20 years is now…
Melting and metallization of silica in the cores of gas giants, ice giants and super Earths
S. Mazevet, T. Tsuchiya, T. Taniuchi +2
The physical state and properties of silicates at conditions encountered in the cores of gas giants, ice giants and of Earth like exoplanets now discovered with masses up to severa…
Mapping the release of volatiles in the inner comae of comets C/2012 F6 (Lemmon) and C/2012 S1 (ISON) using the Atacama Large Millimeter/Submillimeter Array
M. A. Cordiner, A. J. Remijan, J. Boissier +13
Results are presented from the first cometary observations using the Atacama Large Millimeter/Submillimeter Array (ALMA), including measurements of the spatially-resolved distribut…
Radio emissions from pulsar companions : a refutable explanation for galactic transients and fast radio bursts
Fabrice Mottez, Philippe Zarka
The six known highly dispersed fast radio bursts are attributed to extragalactic radio sources, of unknown origin but extremely energetic. We propose here a new explanation - not r…
An Enigmatic Pointlike Feature within the HD 169142 Transitional Disk
Beth A. Biller, Jared Males, Timothy Rodigas +13
We report the detection of a faint pointlike feature possibly related to ongoing planet-formation in the disk of the transition disk star HD 169142. The pointlike feature has a …
Revisiting the transits of CoRoT-7b at a lower activity level
S. C. C. Barros, J. M. Almenara, M. Deleuil +29
CoRoT-7b, the first super-Earth with measured radius discovered, has opened the new field of rocky exoplanets characterisation. To better understand this interesting system, new ob…
Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids ?
Michaël Marsset, Pierre Vernazza, Florian Gourgeot +4
Hilda asteroids and Jupiter Trojans are two low-albedo (p ~ 0.07) populations for which the Nice model predicts an origin in the primordial Kuiper Belt region. However, r…
Photometric and spectroscopic evidence for a dense ring system around Centaur Chariklo
R. Duffard, N. Pinilla-Alonso, J. L. Ortiz +7
In this work we aim to study if the variability in the absolute magnitude of Chariklo and the temporal variation of the spectral ice feature, even its disappearance in 2007, can be…
Physical and orbital properties of Beta Pictoris b
M. Bonnefoy, G. -D. Marleau, R. Galicher +13
The intermediate-mass star Beta Pictoris is known to be surrounded by a structured edge-on debris disk within which a gas giant planet was discovered orbiting at 8-10 AU. The physi…
Low delta-V near-Earth asteroids: A survey of suitable targets for space missions
S. Ieva, E. Dotto, D. Perna +7
In the last decades Near-Earth Objects (NEOs) have become very important targets to study, since they can give us clues to the formation, evolution and composition of the Solar Sys…
Transiting exoplanets from the CoRoT space mission: XXVI. CoRoT-24: A transiting multi-planet system
R. Alonso, C. Moutou, M. Endl +48
We present the discovery of a candidate multiply-transiting system, the first one found in the CoRoT mission. Two transit-like features with periods of 5.11 and 11.76d are detected…
Water Ice and Dust in the Innermost Coma of Comet 103P/Hartley 2
Silvia Protopapa, Jessica M. Sunshine, Lori M. Feaga +7
On November 4th, 2010, the Deep Impact eXtended Investigation (DIXI) successfully encountered comet 103P/Hartley 2, when it was at a heliocentric distance of 1.06 AU. Spatially res…
Unravelling tidal dissipation in gaseous giant planets
Mathieu Guenel, Stéphane Mathis, Françoise Remus
Tidal dissipation in planetary interiors is one of the key physical mechanisms that drive the evolution of star-planet and planet-moon systems. New constraints are now obtained bot…
The albedo-color diversity of transneptunian objects
Pedro Lacerda, Sonia Fornasier, Emmanuel Lellouch +9
We analyze albedo data obtained using the Herschel Space Observatory that reveal the existence of two distinct types of surface among midsized transneptunian objects. A color-albed…
Complex organic molecules in comets C/2012 F6 (Lemmon) and C/2013 R1 (Lovejoy): detection of ethylene glycol and formamide
N. Biver, D. Bockelée-Morvan, V. Debout +9
A spectral survey in the 1 mm wavelength range was undertaken in the long-period comets C/2012 F6 (Lemmon) and C/2013 R1 (Lovejoy) using the 30 m telescope of the Institut de radio…
Very deep images of the innermost regions of the beta Pictoris debris disc at Lp
J. Milli, A. -M. Lagrange, D. Mawet +6
Very few debris discs have been imaged in scattered light at wavelengths beyond 3 microns because the thermal emission from both the sky and the telescope is generally too strong w…
Herschel observations of gas and dust in comet C/2006 W3 (Christensen) at 5 AU from the Sun
M. de Val-Borro, D. Bockelée-Morvan, E. Jehin +19
We aimed to measure the H2O and dust production rates in C/2006 W3 (Christensen) with the Herschel Space Observatory at a heliocentric distance of ~ 5 AU. We have searched for emis…