planet on a black background orbiting a star

SEEC Symposium: Pathways to Characterizing Non-Transiting Planets

April 15 – 19, 2024
NASA Goddard Space Flight Center
Greenbelt Maryland, USA

Click here to register.

Virtual participants: Please fill the following google form. An online participation link will be sent to you closer to the conference date;

Some travel support is available. Please contact the SOC chairs for more information.

Talk Slides should be 16x9 and posters should aim 36"x48" vertical or horizontal.

Hosted by GSFC Sellers' Exoplanet Environments Collaboration and University of Maryland College Park Department of Astronomy

Recent exoplanet surveys from the ground have discovered myriad nearby systems that are non-transiting. Currently, the number of known non-transiting systems dominate by a factor of two compared to transiting ones within 20 pc, and by a factor of 9x within 10 pc. It is expected that the number of detected non-transiting planets will continue to grow in the coming years with more high-precision radial velocity surveys, next-generation direct imaging capabilities, Gaia astrometry, and the launch of flagship space missions like the Roman Space Telescope. This interdisciplinary symposium will focus on exploring pathways to characterize non-transiting planets - in particular, the regions of planetary parameter space that are not well represented in transiting planet characterization studies. The goal will be to engage communities working with ground- and space-based observational methods as well as contextualizing theoretical models to prepare for the characterization of these planets in the next decade.

Focus Topics:

  • Observations of Nearby Non-Transiting Planets: Phase Curves, Radial Velocity, Astrometry, Direct Imaging
  • Demographics of Non-Transiting Planet Population: Microlensing, Radial Velocity, Astrometry
  • Characterization: Planetary Parameters, Atmospheres, and System Architectures Using Space-based
    and Ground-based Approaches
  • Theory and Modeling of Non-Transiting Planets
  • Science Priorities, Technology Gaps, Instruments and Missions

Due to space limitations, the symposium attendance will be limited to 160 attendees.

This symposium is a hybrid meeting. Remote participation is available.

List of invited speakers:

  • Melodie Kao (UC Santa Cruz)
  • Jennifer Burt (JPL)
  • Przemek Mroz (University of Warsaw)
  • Rachel Fernandes (Penn State)
  • Mary Anne Limbach (U. Michigan)
  • Brittany Miles (U. Arizona)
  • Tyler Robinson (U. Arizona)
  • Sarah Millholland (MIT)
  • Yuka Fujii (NAO, Japan)
  • Eduardo Bendek (NASA Ames)
  • Mercedes Lopez-Morales (CFA, Harvard)


A PDF of the schedule is available here.

A PDF of the bus schedule is available here.

To submit your oral presentation, go to

To submit your flash talk, go to

SOC Chairs: Ravi Kopparapu (NASA GSFC), Elisa Quintana (NASA GSFC), Tad Komacek (U. Maryland)

SOC: Daniel Angerhausen (ETH Zurich, LIFE), Jessie Christiansen (IPAC), Matthew Penny (LSU), Sukrit Ranjan (Arizona), Leslie Rogers (UChicago), Rob Zellem (NASA-JPL)

LOC Chairs: Prabal Saxena (NASA GSFC), Erika Kohler (NASA GSFC), Allison Youngblood (NASA GSFC), Aaliyah Kerr (GSFC/SURA)

LOC: Caleb Cañas (NASA GSFC), Achref Dhahbi (NASA GSFC), Vincent Kofman (NASA GSFC), Natasha Latouf (NASA GSFC), Dana Louie (NASA GSFC), Noah Tuchow (NASA GSFC), Nicole Wallack (Carnegie Earth & Planets Laboratory), Robert Washington (Howard University)

Planets moving around a centrally located star

Monday April 15, 2024


NASA Badging, registration

Welcome comments/

Invited Talk - Jennifer Burt (JPL)

(Session chairs: Komacek)

Exploring Nearby Stars: Insights from the MAROON-X EPRV Instrument's Three-Year Survey for Non-Transiting Planets

Ritvik Basant

Unveiling the planetary signals hidden behind the stellar noise : insights for the future Terra Hunting RV survey

Shweta Dalal

Combining (non-transiting) exoplanet measurement techniques to discover, weigh and characterize cold gas giants

Emily Rickman

Flash Talks

(∼15 min buffer)
12:00 - 2:00

(Session chairs: Kofman)


Forward and Reverse: Reflected Light Models for Directly-Imaged Exoplanets

Invited speaker - Ty Robinson
2:30 - 2:45

Candidate Giant Planets Directly Imaged Near Two Metal-Polluted White Dwarf Stars

Susan E. Mullally
2:45 - 3:00

Direct Detection and Characterization of Ice-line Giants with Optical Interferometry

William Balmer
3:00 - 3:15

Probing Formation Pathways of Exoplanets via Atmospheric Characterization

ZJ Zhang
3:15 - 3:45

Coffee Break

Coffee Break
(Session chairs: Allison Youngblood, Erika Kohler)

4:00 - 4:15

Medium Resolution 0.97-5.3 micron spectra of Very Young Benchmark Brown Dwarfs with NIRSpec onboard the James Webb Space Telescope

Elena Manjavacas
4:15 - 4:30

The Nightside Emission Spectrum of WASP-17b Using Planetary Infrared Excess

Kevin Stevenson
4:30 - 4:45

Characterization limitations in visible light from phase curves and direct imaging

Kim Bott
4:45 - 5:00

(∼15 min buffer)

5:00pm: Buses from Goddard to The Hotel at UMD

Tuesday April 16, 2024
Demographics and Characterization I


Buses to Goddard
(Session chairs:)

9:00 -9:30

Demographics of Cold Exoplanets Detected with Gravitational Microlensing

Invited - Przemek Mroz

Mass Measurement of a Cold Microlensing Exoplanet using High-Resolution Follow-up Observations

Clément Ranc

Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey: Detectability of Exomoons

Matthew Lastovka

A Cold Super-Earth and a Sub-Neptune found with Microlensing

Katie Vandorou

Coffee Break
(Session chairs: Amber Young)


Survey Science and Exoplanet Opportunities with the Roman Wide Field Instrument

Josh Schlieder
10:45 - 11:00

Wide Orbit Planet Demographics with Mass Measurements

David Bennett

Characterizing Low Mass Wide Orbit Planets with Roman

Aparana Bhattacharya
11:15 - 11:45

Exoplanet Magnetism

Invited - Melodie Kao
11:45 - 12:00

Ultraviolet and X-ray Characterisation of Exoplanet Host Stars

David Wilson
12:00 - 12:15

Evolution of Flaring Activity with the Beta Pictoris and AB Doradus Moving Groups

Jordan Ealy
12:15 - 12:30

Alycia Weinberger
12:30 - 1:30

1:30 - 3:00

Tour of Goddard
(Session chairs: Kofman)

3:00 - 3:15

Kevin Schlaufman
3:15 - 3:30

Daniel Thorngren
3:30 - 3:45

Natalia Oliveros-Gomez
3:45 - 4:15

Advances in Brown Dwarf and Gas Giant Atmospheric Characterization

Invited speaker - Brittany Miles
4:15 - 4:30

Demonstrating Sub-Jupiter Mass Sensitivity in a JWST NIRCam Coronagraphy Survey for Exoplanets Around Nearby Young M-Dwarfs

Ellis Bogat
4:30 - 4:45

Unveiling directly imaged systems with JWST/MIRI : imaging exoplanets and dust belts

Mathilde Mâlin
4:45 - 5:00

Imaging Exoplanets with Infrared Interferometry

John Monnier

5:00pm: Buses from Goddard to The Hotel at UMD
6:00pm: Conference Banquet, The Hotel at UMD

Wednesday April 17, 2024
Demographics and Characterization II


Buses to Goddard
(Session chairs: Eleonora Alei)

9:00 -9:30

Dynamical Signatures of Non-Transiting Planets

Invited - Sarah Millholland

The Role of Orbital Dynamics In Assessing Planetary Architectures

Stephen Kane

Revisiting RV Searches of WDs for Short Period Planets

John Debes

K2-232c: A Cold Jupiter Hidden in Plain Sight

Jessica Ranshaw

Understanding and Mitigating Stellar Activity with Deep Learning

Mangesh Daspute

The Roadmap to Life Elsewhere: Applying a Decision Tree Framework to Exo-Earth Characterization

Amber Young
10:45 - 11:00

Towards the Detection and Characterization of Non-Transiting Planets with PIE

Laura Mayorga

PSG and EMAC presentations
12:00 - 5:00

Bagged lunch
D.C. tour

Buses will be picking up museum goers from the visitor center to Air & Space museum at 1:00pm for both buses

Thursday April 18, 2024
Characterization/Theory and modeling


Buses to Goddard
(Session chairs: Jacopo Terragni)

9:00 -9:30

White Dwarf Exoplanets in the JWST Era

Invited speaker - Mary Anne Limbach

A Stellar Model-Agnostic Method for PIE Retrievals

Ted Johnson

Probing the Radiative Impact of Water Ice and CO2 Ice to Characterize Non-Transiting Exoplanets

Vidya Venkatesan

Potential Atmospheres, Climates and Habitability of the Nearby Non-Transiting Rocky Exoplanet Wolf 1069 b

Jaime Crouse

Coffee Break
(Session chairs: Allison Youngblood)


Magnetism in the Atmospheres of Ultrahot Jupiters

Heyley Beltz
10:45 - 11:00

A novel approach to include the vertical mixing in the retrieval model of directly imaged exoplanet

Vikas Soni

Spectral Retrievals of Spatially Resolved Planetary-Mass Companions: What are we Learning from JWST?

Arthur Adams
11:15 - 11:45

Connecting the Dots: Bridging Exoplanet Demographics across Detection Techniques

Invited speaker - Rachel Fernandes
11:45 - 12:00

Are we alone? The search for other Earths with Habitable Worlds Observatory

Giada Arney
12:00 - 12:15

Investigating the influence of clouds on the reflectance spectra of exo-Earths using the HWO mission concepts

Soumil Kelkar
12:15 - 12:30

Towards maximizing spectral characterization of exo-Earths for Habitable Worlds Observatory from the near-ultraviolet to the infrared

Rhonda Morgan
12:30 - 2:00

(Session chairs: Komacek)

2:00 - 2:15

Quantifying the Potential of Joint Observations with the Habitable Worlds Observatory and the LIFE Interferometer to Characterize an Earth Twin

Eleonora Alei
2:15 - 2:30

Pale blue dots: using the Planetary Spectrum Generator to simulate signals from Earth-inspired hyper-realistic exo-Earths

Vincent Kofman
2:30 - 2:45

Improving Earth Analogs Characterization: Prior or Better Observations?

Arnaud Salvador
2:45 - 3:15

Prospects for characterizing non-transiting temperate rocky exoplanets in thermal emission without direct imaging

Invited speaker - Yuka Fujii
3:15 - 3:30

The Habitable Worlds Observatory: NASA’s First Astrophysics Flagship in the Great Observatory Maturation Program

Megan Ansdell
3:30 - 4:00

Coffee Break
(Session chairs: Eleonora Alei)

4:00 - 4:15

Analytic relations assessing the impact of precursor knowledge and key mission parameters on direct imaging survey yield

Peter Plavchan
4:15 - 4:30

HPIC: The Habitable Worlds Observatory Preliminary Input Catalog

Noah Tuchow
4:30 - 4:45

4:45 - 5:00

Free time

5:00pm: Buses from Goddard to The Hotel at UMD

Friday April 19, 2024
Science Priorities, Technology Gaps, Instruments, Missions


Buses to Goddard
(Session chairs: Dana Louie)

9:00 -9:30

Detection and mass measurement of earth analogs around binary star systems using astrometry

Invited speaker - Eduardo Bendek

Exploring the Diversity of Planets in the Solar Neighborhood with the Habitable Worlds Observatory

Courtney Dressing

LIFE looks for life - Status and progress of the Large Interferometer for Exoplanets mission

Daniel Angerhausen

Coffee Break
(Session chairs: Amber Young)


The MIRECLE Mission Concept: Revealing the Properties of Non-Transiting Temperate Rocky Planets Orbiting the Nearest M-Stars

Avi Mandell

GPI2 and SCExAO: the two powerful ground-based high-contrast imagers on MaunaKea

Garima Singh
11:20 - 11:40

Finding new direct imaging planets to characterize

Julien Girard

The Far-Infrared Spectroscopy Space Telescope

Meredith MacGregor


12:00pm: Buses from Goddard to The Hotel at UMD

photo of attendees at the Symposium.

Code of Conduct:

The organizers are committed to making this meeting productive and enjoyable for everyone, regardless of gender, sexual orientation, being differently abled, physical appearance, body size, race, nationality or religion. Participants are expected to help create an environment at the meeting and all associated activities that is professional, inclusive, and in which everyone is treated with respect. Please follow these guidelines:

  • All participants are expected to behave professionally and to be respectful – critique ideas and not people.
  • All communication should be respectful and appropriate for a professional audience of many different backgrounds.
  • Please be kind to others. Do not insult or put down other attendees.
  • Participants may share the contents of talks/slides via social media unless speakers have asked that specific details/slides not be shared. If participants wish to share photos of a speaker on social media, it is strongly recommended that they first get the speaker’s permission

Participants asked to stop any inappropriate behaviour are expected to comply immediately. Attendees violating these rules may be asked to leave the event at the sole discretion of the organizers without a refund of any charge.
Any participant who wishes to report a violation of this policy is asked to speak, in confidence, to the lead organizers.

This code of conduct is based on the "London Code of Conduct", as originally designed for the conference "Accurate Astrophysics. Correct Cosmology", held in London in July 2015. The London Code of Conduct was adapted with permission by Andrew Pontzen and Hiranya Peiris from a document by Software Carpentry (, which itself derives from original Creative Commons documents by PyCon and Geek Feminism. It is released under a CC-Zero licence for reuse. To help track people’s improvements and best practice, please retain this acknowledgement, and log your re-use or modification of this policy at