Doppler velocimetry Archives

Idealized Doppler and transit surveys. The top panel shows the results of a Doppler survey in which 100 Sun-like stars are each observed 50 times over one year with 1 m s−1 precision. The bottom panel shows the results of a transit survey in which 104 stars are observed continuously for a year with a photometric precision corresponding to 3×10−5 per 6 hours of data. Each star is assumed to have one planet on a randomly-oriented circular orbit, with random properties drawn from log-uniform distributions between the plotted limits. Colored points are planets detected with a signal-to-noise ratio (SNR) exceeding 10. Gray points are undetected planets. In the Doppler survey, the threshold mass scales as P 1/3 for periods shorter than the survey duration. For longer periods, the threshold mass increases more rapidly, with an exponent depending on the desired false-alarm probability (Cumming 2004). The transit survey includes more stars, because they can be monitored simultaneously, but detects a smaller fraction of the planets and is more strongly biased toward short periods. For periods shorter than survey duration, the threshold radius varies as P 1/6 (Pepper et al. 2003). For longer periods it is impossible to observe more than one transit, making any detections more ambiguous. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Planet Occurrence From Doppler And Transit Surveys

by Keith CowingFebruary 1, 2024February 1, 2024

Prior to the 1990s, speculations about the occurrence of planets around other stars were based only on planet formation theory, observations of circumstellar disks, and the knowledge that at least […]

Schematic of the observing routine on Jupiter by VLT/ESPRESSO on the 22 July 2019. The small circles represent the FOV of the fibre proportional to the size of Jupiter’s disk in the context of these observations (0.5 arc seconds in diameter for the size of the FOV), and their respective labels. We also included a grid to tentatively map the relative position of each observing position in latitude and longitude. Grid lines have intervals of 15∘ on both coordinates. The solid black line on the right side of the spherical grid represents the morning terminator, while the blue dotted line marks the location of the 12 h local time meridian. The picture of the planet’s disk was taken from the Planetary Virtual Observatory and Laboratory. Picture credits go to Gary Walker.

Astronomy & Telescopes, Atmospheres, Climate, Weather, Brown Dwarfs, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Jupiter, Press Release

Comparative Exolanetology: Jupiter Targeted By VLT/ESPRESSO Exoplanet Hunter

by Keith CowingDecember 26, 2023December 26, 2023

For the first time, an instrument to find planets light years away was used on an object in the Solar System, in a study on Jupiter’s winds.

Doppler velocimetry

Planet Occurrence From Doppler And Transit Surveys

Comparative Exolanetology: Jupiter Targeted By VLT/ESPRESSO Exoplanet Hunter

Roman Space Telescope: Enabling Images Of Distant Worlds

NASA Solar System Exploration Research Virtual Institute (SSERVI) Cooperative Agreement Notice (NNH26ZDA016C) Final Text And Due Dates

Interstellar Aromatic Infrared Bands: IR Absorption Spectroscopy Of The Lowest Triplet State Of Naphthalene

The Highly Unusual Behavior And Chemical Composition Of Interstellar Comet 2I/Borisov

Volatile Depletion In Rocky Planets As A Chemical Fingerprint Of Hybrid Accretion