Using Pulsar Timing to Detect Exoplanets Around Pulsars скачать в хорошем качестве

Using Pulsar Timing to Detect Exoplanets Around Pulsars

Help support this channel on Patreon:   / astrophil   Join this channel to get access to perks:    / @astrophil2000   Welcome, my name is Phil, and in this video I discuss how exoplanets orbiting pulsars can be detected due to timing variations in pulses from pulsars. Detecting exoplanets around pulsars using pulsar timing involves monitoring the precise timing of pulsar pulses. Pulsars are highly magnetized, rotating neutron stars emitting electromagnetic radiation from their magnetic poles. As a pulsar rotates, these beams sweep across space, and if aligned with Earth, they can be observed as regular pulses of radiation, similar to the ticking of a very precise cosmic clock. Here's how pulsar timing is used to detect exoplanets: Regular Monitoring of Pulses: Astronomers measure the arrival times of pulses from a pulsar with extreme precision. Any variations in the timing of these pulses can indicate the presence of an orbiting exoplanet. Timing Anomalies: When an exoplanet orbits a pulsar, it exerts a gravitational pull on the pulsar. This interaction causes the pulsar to move slightly in its own small orbit around the common center of mass of the pulsar-exoplanet system. This movement causes variations in the time it takes for the pulses to reach Earth, known as "timing anomalies." Periodic Variations: By analyzing the timing anomalies, astronomers look for periodic variations in the pulse arrival times. These periodic changes can indicate the presence of an exoplanet. The period of the variation corresponds to the orbital period of the exoplanet. Orbital Parameters: Detailed analysis of the timing anomalies allows astronomers to determine the orbital parameters of the exoplanet, such as its orbital period, distance from the pulsar, and mass. The amplitude and shape of the timing variations provide insights into these parameters. Confirming the Detection: Multiple observations and careful analysis are required to confirm that the timing variations are indeed due to an exoplanet and not other factors, such as intrinsic changes in the pulsar or measurement errors. The first exoplanets ever discovered were found around the pulsar PSR B1257+12 using this pulsar timing method in the early 1990s.