Uploaded August 2023 | Updated September 2026, 3 weeks ago
Guest Speaker: Jack Lubin, PhD, UCLA.
Summary:
In this video, Dr. Lubin explains how studying the sinusoidal shift in the radial velocity (RV) in a star system can be used to determine the existence of exoplanets revolving around the star. This method contrasts with another method called the Transient Detection method, which studies the rise and fall in intensity of the starlight as the exoplanet crosses in front of the star in our line of vision. The RV method studies the Doppler shift in the absorption lines of the stellar spectrum due to the influence of an exoplanet rotating the star. By examining the amount of the Doppler shift, this method allows for the measurement of the exoplanet's mass and can serve to provide the base data for future imaging surveys using space telescopes.
If you are interested in how astronomers use different methods to discover exoplanets, this video will help you better understand this. We hope you enjoy it!
iTelescope itelescope.net
Chapters
0:00 Introduction
1:57 What is radial velocity (RV)?
4:54 Importance of using RV
6:32 What type of exoplanets can we see using RV?
9:00 How stellar activity impacts RV measurements
11:43 Pushing the boundary of RV
14:00 Using Barnard’s star as a case study
28:36 Summary of what was learned studying Barnard’s Star
29:58 Finding localized signals
31:37 L1A or LIA method
39:23 Summary
#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology
Guest Speaker: Jack Lubin, PhD, UCLA.
Summary:
In this video, Dr. Lubin explains how studying the sinusoidal shift in the radial velocity (RV) in a star system can be used to determine the existence of exoplanets revolving around the star. This method contrasts with another method called the Transient Detection method, which studies the rise and fall in intensity of the starlight as the exoplanet crosses in front of the star in our line of vision. The RV method studies the Doppler shift in the absorption lines of the stellar spectrum due to the influence of an exoplanet rotating the star. By examining the amount of the Doppler shift, this method allows for the measurement of the exoplanet's mass and can serve to provide the base data for future imaging surveys using space telescopes.
If you are interested in how astronomers use different methods to discover exoplanets, this video will help you better understand this. We hope you enjoy it!
iTelescope itelescope.net
Chapters
0:00 Introduction
1:57 What is radial velocity (RV)?
4:54 Importance of using RV
6:32 What type of exoplanets can we see using RV?
9:00 How stellar activity impacts RV measurements
11:43 Pushing the boundary of RV
14:00 Using Barnard’s star as a case study
28:36 Summary of what was learned studying Barnard’s Star
29:58 Finding localized signals
31:37 L1A or LIA method
39:23 Summary
#iTelescope
#astrophotography
#deepsky
#astro
#astronomy
#cosmology
