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Title: Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J0328–1219

Journal Article · · The Astrophysical Journal
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [11]; ORCiD logo [12]; ORCiD logo [13]; ORCiD logo [14]; ORCiD logo [14]; ORCiD logo [11]
  1. Univ. of Texas, Austin, TX (United States); McDonald Observatory, Fort Davis, TX (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Univ. of Texas, Austin, TX (United States)
  4. Hereford Arizona Observatory, AZ (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Foundation for Scientific Advancement, Sierra Vista, AZ (United States)
  7. Carnegie Inst. of Science, Washington, DC (United States)
  8. Univ. of California, San Diego, CA (United States)
  9. Univ. of California, Los Angeles, CA (United States)
  10. Univ. of Wisconsin, Madison, WI (United States)
  11. Boston Univ., MA (United States)
  12. Univ. of North Carolina, Chapel Hill, NC (United States)
  13. Univ. of Leicester (United Kingdom)
  14. South African Astronomical Observatory, Cape Town (South Africa)

We present follow-up photometry and spectroscopy of ZTF J0328-1219, strengthening its status as a white dwarf exhibiting transiting planetary debris. Using TESS and Zwicky Transient Facility photometry, along with follow-up high-speed photometry from various observatories, we find evidence for two significant periods of variability at 9.937 and 11.2 hr. We interpret these as most likely the orbital periods of different debris clumps. Changes in the detailed dip structures within the light curves are observed on nightly, weekly, and monthly timescales, reminiscent of the dynamic behavior observed in the first white dwarf discovered to harbor a disintegrating asteroid, WD 1145+017. We fit previously published spectroscopy along with broadband photometry to obtain new atmospheric parameters for the white dwarf, with M* = 0.731 ± 0.023 M⊙, Teff = 7630 ± 140 K, and [Ca/He] = - 9.55 ± 0.12. With new high-resolution spectroscopy, we detect prominent and narrow Na D absorption features likely of circumstellar origin, with velocities 21.4 ± 1.0 km s-1 blueshifted relative to atmospheric lines. We attribute the periodically modulated photometric signal to dusty effluents from small orbiting bodies such as asteroids or comets, but we are unable to identify the most likely material that is being sublimated, or otherwise ejected, as the environmental temperatures range from roughly 400 to 700 K.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE
Grant/Contract Number:
89233218CNA000001; NA0003843
OSTI ID:
1822805
Report Number(s):
LA-UR--21-21884
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 917; ISSN 0004-637X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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