Topics

A giant exoplanet orbiting a very-low-mass star challenges planet formation models.

08:00 EDT 27th September 2019 | BioPortfolio

Summary of "A giant exoplanet orbiting a very-low-mass star challenges planet formation models."

Surveys have shown that super-Earth and Neptune-mass exoplanets are more frequent than gas giants around low-mass stars, as predicted by the core accretion theory of planet formation. We report the discovery of a giant planet around the very-low-mass star GJ 3512, as determined by optical and near-infrared radial-velocity observations. The planet has a minimum mass of 0.46 Jupiter masses, very high for such a small host star, and an eccentric 204-day orbit. Dynamical models show that the high eccentricity is most likely due to planet-planet interactions. We use simulations to demonstrate that the GJ 3512 planetary system challenges generally accepted formation theories, and that it puts constraints on the planet accretion and migration rates. Disk instabilities may be more efficient in forming planets than previously thought.

Affiliation

Journal Details

This article was published in the following journal.

Name: Science (New York, N.Y.)
ISSN: 1095-9203
Pages: 1441-1445

Links

DeepDyve research library

PubMed Articles [9172 Associated PubMed Articles listed on BioPortfolio]

Vortex fiber nulling for exoplanet observations. I. Experimental demonstration in monochromatic light.

Vortex fiber nulling is a method for spectroscopically characterizing exoplanets at small angular separations, ≲λ/D, from their host star. The starlight is suppressed by creating an optical vortex ...

Obliquity Evolution of the Potentially Habitable Exoplanet Kepler-62f.

Variations in the axial tilt, or obliquity, of terrestrial planets can affect their climates and therefore their habitability. Kepler-62f is a 1.4 R planet orbiting within the habitable zone of its K2...

Examining Green Star certification uptake and its relationship with Building Information Modelling (BIM) adoption in New Zealand.

Although academia has concentrated on issues related to green building recently, Green Star, considered as the primary green rating system in New Zealand, has not caught adequate attention, leading to...

Black-Hole Remnants from Black-Hole-Neutron-Star Mergers.

Observations of gravitational waves and their electromagnetic counterparts may soon uncover the existence of coalescing compact binary systems formed by a stellar-mass black hole and a neutron star. T...

Intrinsic Climate Cooling.

Lower heating of our planet by the young Sun was compensated by higher warming from factors such as greater greenhouse gas concentrations or reduced albedo. Earth's climate history has therefore been ...

Clinical Trials [2358 Associated Clinical Trials listed on BioPortfolio]

Mobile Technology & Online Tools to Track Adherence in Chronic Illness Patients

The purpose of this project is to test the efficacy of Planet T1D, a mobile and web-based technology infrastructure specifically designed to (a) enhance youths' type 1 diabetes disease- an...

Evaluation of the Planet Nutrition Program on Obesity Parameters in Mexican Schoolchildren

Obesity prevention programs in schools are essential to promoting healthy lifestyles. There are programs with positive effects on obesity parameters, but only a few of them have didactic m...

Mobile Technology and Online Tools to Track Adherence in Chronic Illness Patients

The purpose of this project is to test the efficacy of Planet K, a mobile and web-based technology infrastructure specifically designed to (a) enhance youths' chronic kidney disease- and t...

Alternative Treatment of Giant Spinal Schwannomas

Schwannomas are benign tumors that can reach giant sizes. The diagnosis and treatment of these cases differ from those of small schwannomas. The aim of this study was to review the diagnos...

Hydroxychloroquine in Giant Cell Arteritis

Cortico-dependence is frequent in giant cell arteritis patients, and no drugs has proved its ability to prevent corticodependence. Hydrocychloroquine is a well tolerated immunomodulatory d...

Medical and Biotech [MESH] Definitions

Multinucleated cells (fused macrophages) seen in granulomatous inflammations such as tuberculosis, syphilis, sarcoidosis, and deep fungal infections. They resemble foreign-body giant cells (GIANT CELLS, FOREIGN BODY) but Langhans giant cells contain less chromatin and their nuclei are arranged peripherally in a horseshoe-shaped pattern. Langhans giant cells occur frequently in delayed hypersensitivity.

Multinucleated cells (fused macrophages), characteristic of granulomatous inflammation, which form around exogenous material in the skin. They are similar in appearance to Langhans giant cells (GIANT CELLS, LANGHANS), but foreign-body giant cells have more abundant chromatin and their nuclei are scattered in an irregular pattern in the cytoplasm.

A non-neoplastic inflammatory lesion, usually of the jaw or gingiva, containing large, multinucleated cells. It includes reparative giant cell granuloma. Peripheral giant cell granuloma refers to the gingiva (giant cell epulis); central refers to the jaw.

A mass spectrometry technique using two (MS/MS) or more mass analyzers. With two in tandem, the precursor ions are mass-selected by a first mass analyzer, and focused into a collision region where they are then fragmented into product ions which are then characterized by a second mass analyzer. A variety of techniques are used to separate the compounds, ionize them, and introduce them to the first mass analyzer. For example, for in GC-MS/MS, GAS CHROMATOGRAPHY-MASS SPECTROMETRY is involved in separating relatively small compounds by GAS CHROMATOGRAPHY prior to injecting them into an ionization chamber for the mass selection.

Tumors of bone tissue or synovial or other soft tissue characterized by the presence of giant cells. The most common are giant cell tumor of tendon sheath and GIANT CELL TUMOR OF BONE.

Quick Search


DeepDyve research library

Searches Linking to this Article