In 2017 the circumplanetary region of the directly imaged planet beta Pic b transited in front of the star. This created a rare opportunity to detect the ring system of an extrasolar giant planet with semi-major axis 10 au. The search for evidence of ring was conducted over many months using a host of space-based facilities and ground-based telescopes located on four continents, including Antarctica. This 3-day workshop in Nice, France, endeavors to share the status of various data sets, devise common analysis techniques, and produce self-consistent models and interpretation for publication in the peer-reviewed literature.

The workshop will be held at the Observatoire de Nice. No registration fee is necessary, and lunch will be provided. Limited support is available for participants who would not be able to attend otherwise. A bus will take participants from the city to the workshop venue. The deadline for abstracts is August 1st, 2018. Late abstracts may be considered.

(Note: Site construction in progress)

Tuesday, September 18th

Morning TOPIC: Overview of data collected during the Hill Sphere transit

Objective: All observing groups to report on the data obtained during 2016-2018 on Beta Pictoris in 10 minute presentations. For photometry, report: the cadence, the precision, the total number of photometric points. For spectroscopy: the cadence, the signal to noise, the wavelength range, the spectral resolution.

This is to bring everyone up to date with the data collected on Beta Pictoris in preparation for the next two days of the Workshop.

Afternoon TOPIC: Models of observable signals to search for in the data

Objective: Short presentations on the “known knowns” to search for and confirm in the data.

  1. What is physically in the Beta Pictoris system?
    • Planet and comets - orbital dynamics
    • Debris disk - structure and composition
    • Exocomets - what gases/species to expect in spectroscopy?
  2. Models for circumplanetary and circumstellar gas
  3. Delta Scuti pulsations and other star properties
  4. Interstellar absorption (really stretching this….)
  5. Any other topic

Wednesday, September 19th

Full Day TOPIC: Breakout sessions

Objective: what analysis should be done, what papers to write, and combine data if required, assign people to lead the groups on each topic.
Photometric time series - analysis of Delta Scuti pulsations, search for Hill sphere extinction, look for transits of Beta Pictoris c,d,e…., apply Eratosthenes’ Sieve (i.e. remove Delta Scuti, periodic signals, until you are left with white noise?)
Spectroscopic time series - infalling exocomets, highly ionised species, evidence of shocked gas, dynamics of circumstellar gas, dynamics of circumplanetary gas

Thursday, September 20th

Morning TOPIC: Continuing the Breakout Sessions

Objective: Continue work on groups.

Afternoon TOPIC: Reports from the Working Groups

Propose ongoing work and papers within the Working Groups.

If 21st is still available, optionally continue on papers and working groups.


caractères restants

Observatoire de la côte d'Azur


96 Boulevard de l'Observatoire, 06300 Nice



LOC: Lyu Abe, Lionel Bigot, Tristan Guillot, Djamel Mékarnia, Sophie Rousset (Lagrange/OCA)

SOC: Paul Kalas (Berkeley University), Anne-Marie Lagrange (OPAG), Tristan Guillot (Lagrange/OCA), Matthew Kenworthy (Leiden University), Alain Lecavelier (IAP), Konstanze Zwintz (Innsbruck University), Ernst De Mooij (DCU)

Observatoire de la Côte d'AzurLaboratoire J.-L. LAGRANGECNRSUniversité Côte d'AzurIPEVFrance-Berkeley Fund