Exomoon Detection: Transit Depth Variations скачать в хорошем качестве

Exomoon Detection: Transit Depth Variations

Join this channel to get access to perks:    / @astrophil2000   Support this channel on Patreon: patreon.com/astrophil Welcome to this video where I discuss another method that can be used to detect exomoons. Exomoons are moons that orbit planets around stars other than our Sun, also know as exoplanets. However, only a handful of candidates have been identified despite thousands of exoplanets being discovered. One method of detecting exomoons is by looking asymmetric transits of the host exoplanet. As the exoplanet and exomoon orbit a common centre of mass the exoplanet is in a different orientation each transit. This can cause the transit be asymmetric in shape as sometimes the exomoon transits first, followed by the exoplanet. While the next transit the exoplanet might lead the exomoon. However, a variation of this is if the exomoon orbit is inclined compared to the exoplanet orbit around the star. Here, the orbit of the exoplanet around the centre of mass of the exomoon - exoplanet system would result in the exoplanet transiting a different part of the star each transit. Due to limb darkening (the star is brightest in the centre compared to the outer edge) the exoplanet blocks out most light if it passes the centre of the star. It will block out less light towards the edge of the star. Looking for variations in the depth, or how much light is blocked out, each transit can help identify the presence of unseen exomoons.