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  • KITP Follow Up Program Application

    The KITP invites collaborating researchers who were participants of selected recent programs to apply to visit, in order to pursue work initiated during their prior KITP visits. The goal is to enhance those collaborative efforts initiated at a KITP program that would clearly benefit from a brief, focused return to the KITP.

    Groups of 2-6 members with established collaborations arising from the following programs may apply to visit for 1 or 2 weeks during the period October 26-December 18, 2015:

    • Magnetism, Bad Metals and Superconductivity: Iron Pnictides and Beyond

    • Galactic Archaeology and Precision Stellar Astrophysics

    • Dynamics and Evolution of Earth-like Planets

    • Quantum Gravity Foundations: UV to IR

    Proposals should be short, consisting of 1-2 pages justifying the group of researchers who will participate, explaining the science and objectives that the group will pursue during the visit, and explicitly stating the preferred dates when the group can come. Visits must be for one or two complete weeks, with all applicants in residence at the same time. Applying to the program consists of two steps:

    1. One collaborator must submit the group’s proposal at Form.

    2. Each member of the proposed group must also fill out a brief online application at Activities.

    All application materials must be received by July 5, 2015. Invitations will be issued by July 17, 2015.

    For those invited to participate, KITP will reserve and directly pay for housing at West Cottages and provide office space in Kohn Hall during the visits. Visitors will be fully responsible for travel, meals and any other expenses.

    The team members enjoyed a very productive period of collaboration during the Galactic Archaeology and Precision Stellar Astrophysics program at KITP in 2015. That collaboration led to the development of a new asteroseismic technique allowing to measure internal magnetic fields in stars. This major breakthrough now allows to interpret the wealth of space-asteroseismic data and unveil the evolution of magnetism in stellar interiors. We are planning to meet again at KITP to investigate: 1) the existence of strong magnetic fields within stars on the red clump, 2) “Droopy-like” stars (stars allowing for a more precise measurement of their internal magnetic fields), 3) the occurrence of magnetic fields in cluster stars and 4) constrain the geometry of internal magnetic fields.

    Application: “Suppressed Dipoles”

    Dear Dr. Berlinsky, Please consider our application for a 1 week visit following the KITP program “Galactic Archaeology and Precision Stellar Astrophysics”. The proposing team wants to meet again to continue some very exciting work that was started at KITP and led to groundbreaking results in the field of stellar physics and asteroseismology. Please find below possible dates, a brief description of the results that the team achieved during/after the KITP program and the follow up work we intend to perform while together at KITP. A team justification closes this application.

    Possible dates

    (TBD: Please fill this Doodle)
    15-22 November (strong preference for this week)
    6-13 December


    The team members enjoyed a very productive period of collaboration during the Galactic Archaeology and Precision Stellar Astrophysics program at KITP in 2015. That collaboration led to two papers on red giant asteroseismology, recently submitted to Science and Nature. The first paper discussed the ability to measure internal magnetic fields in red giant stars using asteroseismology, and the second used this technique to constrain/measure magnetic fields in the core of thousands of red giant stars. We believe this work has paved the way to a new sub-field of stellar astrophysics that is ripe for additional study. Consequently, there are several research topics which we wish to pursue during a follow-up visit to KITP.

    Project Overview

    The first research topic we intend to investigate is the existence of strong magnetic fields within stars on the red clump. The previous works only analyzed stars ascending the red giant branch, but similar physics will occur for red clump stars burning helium in their cores. However, identifying the asteroseismic signature of strong magnetic fields in clump stars is slightly more difficult because they are difficult to distinguish from ascending red giants. Collaboration between the team members will allow us to work out the details of this process from the observational end, and what can be learned from these observations on the theoretical end.

    A second topic of investigation are “Droopy-like” stars that show a particular asteroseismic signature that allows for a more precise measurement of their internal magnetic fields. Thus far, only one star KIC 8561221 (“Droopy”) that shows this signature has been analyzed in detail (Garcia et al. 2014). However, more Droopy-like stars likely exist. We intend to identify these stars in the data, measure their internal magnetic field strengths, and use them to trace the evolution of internal magnetic field strengths in red giant stars.

    Third, we hope to use additional time at KITP to examine the occurrence of magnetic fields in cluster stars. These stars have nearly identical ages and compositions and provide the perfect testbed to understand evolution of magnetic fields in a uniform population of stars. Red giant cluster stars exist in both Kepler data and recent and upcoming K2 fields, with substantial data already secured by the team. These red giants are found in several clusters (of differing ages and metallicities) and can be used to understand the development of magnetic fields in different populations of stars.

    As a fourth research topic (time permitting) we will try to constrain the geometry of internal magnetic fields in red giants with suppressed dipoles, using the scattering properties of dipolar gravity waves on the magnetic fields.

    Proposing Team and Team Justification

    1. Lars Bildsten (KITP resident)

    2. Matteo Cantiello (KITP resident)

    3. Jim Fuller (Caltech)

    4. Rafael A. Garcia (CEA, Paris)

    5. Stéphane Mathis (CEA, Paris)

    6. Dennis Stello (Sydney University)

    Five of the six team members outlined above are the main authors in the two papers submitted to Science (Theory) and Nature (Observations). Thanks to their complementary expertises, this group of scientists found a remarkable synergy while at KITP. Thanks to the presence of both theorists and observers, we were able to quickly identify an observational puzzle, find a theoretical explanation and test it on brand new data. In the process this led to the discovery of a novel, powerful way to look for magnetic fields in stellar interiors. The team has remained in touch and active after meeting at KITP, but it’s clear that only re-creating a full-immersion atmosphere can lead to rapid progress on the follow-up research program.