A rich population of free-floating planets in the Upper Scorpius young stellar association

  title={A rich population of free-floating planets in the Upper Scorpius young stellar association},
  author={N. Miret-Roig and H. Bouy and Sean N. Raymond and Motohide Tamura and Emmanuel Bertin and David Barrado and Javier Olivares and P. A. B. Galli and Jean-Charles Cuillandre and Luis M. Sarro and Angel Berihuete and N. Hu'elamo},
  journal={Nature Astronomy},
The nature and origin of free-floating planets (FFPs) are still largely unconstrained because of a lack of large homogeneous samples to enable a statistical analysis of their properties. So far, most FFPs have been discovered using indirect methods; microlensing surveys have proved particularly successful to detect these objects down to a few Earth masses 1 , 2 . However, the ephemeral nature of microlensing events prevents any follow-up observations and individual characterization. Several… 

Rogue Planets and Brown Dwarfs: Predicting the Populations Free-floating Planetary Mass Objects Observable with JWST

Free-floating (or rogue) planets are planets that are liberated (or ejected) from their host systems. Although simulations predict their existence in substantial numbers, direct observational

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HD 106906 is a planetary system that hosts a wide-orbit companion, as well as an eccentric and flat debris disk, which hold important constraints on its formation and subsequent evolution. The recent

The SPHERE view of multiple star formation

While a large fraction of the stars are in multiple systems, our understanding of the processes leading to the formation of these systems is still inadequate. Given the large theoretical

Is the Black-widow Pulsar PSR J1555–2908 in a Hierarchical Triple System?

The 559 Hz black-widow pulsar PSR J1555−2908, originally discovered in radio, is also a bright gamma-ray pulsar. Timing its pulsations using 12 yr of Fermi-Large Area Telescope gamma-ray data reveals

The Volatile Carbon-to-oxygen Ratio as a Tracer for the Formation Locations of Interstellar Comets

Based on the occurrence rates implied by the discoveries of 1I/‘Oumuamua and 2I/Borisov, the forthcoming Rubin Observatory Legacy Survey of Space and Time (LSST) should detect ≥one interstellar

Orbital Migration of Protoplanets in a Marginally Gravitationally Unstable Disk. II. Migration, Merging, and Ejection

  • A. Boss
  • Geology, Physics
    The Astrophysical Journal
  • 2023
Protoplanets formed in a marginally gravitationally unstable (MGU) disk by either core accretion or disk instability will be subject to dynamical interactions with massive spiral arms, possibly




A microlensing survey by Sumi et al. exhibits an overabundance of short-timescale events (STEs; tE < 2 days) relative to what is expected from known stellar populations and a smooth power-law

Exploring the planetary-mass population in the Upper Scorpius association

We aim at identifying very low-mass isolated planetary-mass member candidates in the nearest OB association to the Sun, Upper Scorpius (USco) (145 pc; 5–10 Myr), to constrain the form and shape of

Age Determination in Upper Scorpius with Eclipsing Binaries

The Upper Scorpius OB association is the nearest region of recent massive star formation and thus an important benchmark for investigations concerning stellar evolution and planet formation

New Young Stars and Brown Dwarfs in the Upper Scorpius Association

To improve the census of the Upper Sco association, candidate members are identified using parallaxes, proper motions, and color-magnitude diagrams from several wide-field imaging surveys and optical and infrared spectra of several hundred candidates are obtained to measure their spectral types and assess their membership.

Undetected Binary Stars Cause an Observed Mass-dependent Age Gradient in Upper Scorpius

Young stellar associations represent a key site for the study of star formation, but to accurately compare observations to models of stellar evolution, the age of an association must be determined.

A Terrestrial-mass Rogue Planet Candidate Detected in the Shortest-timescale Microlensing Event

Some low-mass planets are expected to be ejected from their parent planetary systems during early stages of planetary system formation. According to planet formation theories, such as the core

A WISE Survey of Circumstellar Disks in the Upper Scorpius Association

We have performed a survey for new members of the Upper Sco association that have circumstellar disks using mid-infrared photometry from the Wide-field Infrared Survey Explorer (WISE). Through

The effects of dynamical interactions on planets in young substructured star clusters

We present N-body simulations of young substructured star clusters undergoing various dynamical evolutionary scenarios and examine the direct effects of interactions in the cluster on planetary

Survivability of planetary systems in young and dense star clusters

Aims. We perform a simulation using the Astrophysical Multipurpose Software Environment of the Orion Trapezium star cluster in which the evolution of the stars and the dynamics of planetary systems

The formation of free-floating brown dwarves and planetary-mass objects by photo-erosion of prestellar cores

We explore the possibility that, in the vicinity of an OB star, a prestellar core which would otherwise have formed an intermediate or low-mass star may instead form a free-floating brown dwarf or