WD1145 HAO

9. White Dwarf WD 1145+017 Photometric Monitoring Observations by Amateur Observer Bruce L. Gary
B. L. Gary, this is the 9th web page devoted to my observations of WD1145. Last updated 2022.07.16

1 of 9 - 2015.11.01 to 2016.01.21: LC Observations - 1st set of LCs, for 2015/16 observing season
2 of 9 - 2016.01.17 to 2016.07.13: LC Observations - 2nd set of LCs, for 2015/16 observing season
3 of 9 - 2015.11.01 to 2016.07.13: LC Observations - 3rd set of LCs, for 2015/16 observing season (N = 158) + Overview, Results & Model Speculations
4 of 9 - 2016.10.25 to 2017.06.18: LC Observations - 4th set of LCs, for 2016/17 observing season
5 of 9 - 2017.10.23 to 2018.06.19: LC Observations - 5th set of LCs, for 2017/18 observing season
6 of 9 - 2018.11.06 to 2018.07.09 LC Observations - 6th set of LCs, for 2018/19 observing season
7 of 9 - 2019.12.02 to 2020.07.09   LC Observations - 7th set of LCs, for 2019/20 observng season
8 of 9 - 2020.11.19 to 2021.06.07 LC Observations - 8th set of LCs for 2020721 observing season
Previous observing seasons summary of results:    Observational findings that need to be explained by models
9 of 9 - 2021.12.12 to present       LC Observations - 9th set of LCs, for 2021/22 observing season (YOU ARE HERE)
10th observing season (for 2022/23) web page is at http://www.brucegary.net/zombie10/

Links on this web page:
Status & Summary of Results for recent observations
Observing session LCs
Finder image & basic info
Data exchange files (for all years: 2015/16, 2016/17, etc)
My collaboration policy
References & related external links
Summary of 3.7 years of ground-based LC measurements
Collisions (tutorial: Collisions for Dummies, other web site)
Cloud crossing event (on another web page)

Status & Summary of Results for this Observing Season:

The level of dip activity this observing season is similar to what the Kepler spacecraft observed (before the rise in activity level the following year).

The next 4 graphs show the level of "dust production dip activity" vs. date:

Activity for the last nine years, using a log scale for activity.

Activity for the last nine years, using a linear scale for activity.

Activity for the last two observing seasons, using a linear scale for activity.

Activity for the current observing season using a linear scale for activity.

Waterfall plot for the first half of this observing season.

Detailed waterfall plot for the dates that include a "collision" on April 5.

Waterfall plot showing possible drift line with a longer perod than usual, corresponding to the D-system.

List of observing sessions

2022.07.16
2022.07.07
2022.06.14
2022.06.13
2022.06.05
2022.05.31
2022.05.26
2022.05.23
2022.05.18
2022.05.15
2022.05.14
2022.05.08
2022.05.07
2022.05.06
2022.05.05
2022.05.03
2022.05.02
2022.04.30
2022.04.29
2022.04.28
2022.04.26
2022.04.25
2022.04.24
2022.04.23
2022.04.22
2022.04.21
2022.04.20
2022.04.19
2022.04.18
2022.04.17
2022.04.09
2022.04.08
2022.04.07
2022.04.06
2022.04.02
2022.03.31
2022.03.27
2022.03.26
2022.03.25
2022.03.24
2022.03.12
2022.03.09
2022.03.07
2022.03.02
2022.02.27
2022.02.26
2022.02.25
2022.02.22
2022.01.26
2022.01.07
2021.12.12
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2022.07.16

2022.07.07

2022.06.14

2022.06.13

2022.06.05

2022.05.31

2022.05.26

2022.05.23

2022.05.18

2022.05.15

2022.05.14

2 days before full caused high noise level. Don't believe that dip.

2022.05.08

2022.05.07

2022.05.06

2022.05.05

I don't believe this dip is real, but it seems to have statistical significance.

2022.05.03

2022.05.02

2022.04.30

2022.04.29

Too noisy for additional processing.

2022.04.28

2022.04.26

Uses new photometry procedure: apertures of 2, 3, 4 and 5 px, weighted & variable during LC.

Uses new photometry procedure: apertures of 2, 3, 4 and 5 px, weighted & variable during LC.

Uses my old processing procedure: photometry apertures of 4, 5 & 6 px, same for entire LC.

Uses new processing procedure: photometry apertures of 2, 3, 4 & 5 px, weighted & variable during LC.

Uses my old processing procedure: photometry apertures of 4, 5 & 6 px, same for entire LC.

2022.04.25

2022.04.24

2022.04.23

All model fits are solved using "sum of chi squares."

2022.04.22

2022.04.21

2022.04.20

2022.04.19

This is the first time I've seen dips spaced 5.0 hrs apart, corresponding to approximately the Kepler data's F period (longest period).

2022.04.18

2022.04.17

A full moon raised the noise level by a factor of 3. I was curious to learn how severe the penalty would be for observing at this time.

2022.04.09

2022.04.08

2022.04.07

2022.04.06

2022.04.02

2022.03.31

2022.03.27

2022.03.26

2022.03.25

2022.03.24

2022.03.12

2022.03.09

2022.03.07

2022.03.02

2022.02.27

2022.02.26

If there's a 5.10-hr periodicity it must now have a low amplitude.

2022.02.25

2022.02.22

This 10 % dip may not be real.

2022.01.26

This 4 % dip may not be real.

2022.01.07

2021.12.12

Finder Image

Finder image. FOV = 15.6 x 10.5 'arc. North up, east left. (Image taken with 16" AstroTech .)

RA/DE = 11:48:33.6 +01:28:29, B-V = +0.26, r'-mag = 17.2, Teff = 15,020 K (young cooling age ~ 224 My), Spectral Type DBZA, He atmosphere, photospheric absorption lines for 11 "metals," star mass = 0.63 M_sun, R = 1.29 R_earth, distance = 142 parsec.

Data Exchange Files

    2015.11.21 to 2016.07.15
    2016.10.25 to 2017.06.18
    2017.11.10 to 2018.06.18
    2018.11.09 to 2019.06.09
    2019.12.02 to 2020.07.09
    2020.12.xx to 2021.03.22 (more to come)

Data exchange files are available in two formats: light curve details (one line per image) and dip fits (asymmetric hypersecant (AHS) model fits for each dip). The first of these is available for download using the above links (though I recommend that anyone using these data check with me for updates since I sometimes find errors and post the corrected files here). Data exchange files of the second format (AHS dip fits) may be requested from B.Gary. These may also be available here in due time.

My Collaboration Policy

Please don't ask me to co-author a paper! At my age of 81 I'm entitled to have fun and avoid work. Observing and figuring things out is fun; writing papers is work.

My observations are now "in the public domain" for this observing season (2020/21). If my data is essential to any publication just mention this in the Acknowledgement section.

References

    Budaj, Jan, Andrii Maliuk and Ivan Hubeny, 2022, "WD 1145+017: Alternative Models of the Atmospherre, Dust CLouds and Gas Rings, arXiv
    Farihi, J., J. J. Hermes, T. R. Marsh & 11 others, 2021, "Relentless and Complex Transits from a Planetesimal Debris Disk," submitted to MNRAS, arXiv
    Guidry, Joseph A., Zachary P. Vanderbosch, J. J. Hermes & 13 others, 2020, "I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility," ApJ, arXiv
    Duvvuri,Girish M., Seth Redfield and Dimitri Veras, 2021, "Necroplanetology: Simulating the Tidal Disruption of Differentiated Planetary Material Orbiting WD 1145+017," accepted by ApJ, arXiv
Steckloff, Jordan K., John Debes, Amy Steele, Brandon Johnson, Elizabeth R. Adams, Seth A. Jacobson, Alessondra Springman, "How Sublimation Delays the Obset of Dusty Debris Disk Formation Around White Dward Stars," 2021, arXiv
Duvvuri, Girish M., Seth Redfield and Dimitri Veras, 2020, "Necroplanetology: Simulating the Tidal Disruption of Differentiated Planetary Material Orbiting WD 1145+017," submitted to ApJ, arXiv
    Fortin-Archambault, M., P. Dufour, S. Xu, 2019, "Modeling of the Variable Circumstellar Absorption Features of WD 1145+017," arXiv
    Xu, Siyi, Na'ama Hallokoun, Bruce Gary, Paul Dalba, John Debes and 14 others, 2019, "Shallow Ultraviolet Transits of WD 1145+017," arXiv
    Gansicke, Boris T., Matthias R. Schreiber, Odette Toloza, Nicola P. Gentile Fusillo, Detlev Koester and Christopher L. Manser, 2019, "Accretion of a Giant Planet onto a White Dwarf," arXiv
    Gansicke, Boris + 26 others, 2019, "Evolved Planetary Systems around White Dwarfs," Astro 2020 Science White paper, arXiv
    Manser, Christopher + 31 others, 2019, "A Planetesimal Orbiting the Debris Disk around a White Dwarf Star," arXiv
    Veras, Dimitri + 8 others, 2019, "Orbital Relaxation and Excitation of Planets Tdally Interacting with White Dwarfs," arXiv
    Vanderburg, Andrew and Saul A. Rappaport, 2018, "Transiting Disintegrating Debris around WD 1145+017," arXiv
    Rappaport, S. B. L. Gary, A. Vanderburg, S. Xu, D. Pooley & K. Mukai, "WD 1145+017: Optical Activity During 2016-2017 and Limits on the X-Ray Flux," MNRAS, arXiv
    Xu, S., S. Rappaport, R. van Lieshout & 35 others, "A dearth of small particles in the transiting material around the white dwarf WD 1145+017," MNRAS link, preprint arXiv: 1711.06960
    Vanderburg et al, 2015, "A Disintegrating Minor Planet Transiting a White Dwarf," Nature, 2015 Oct 22, arXiv:1510.063387
    Croll et al, 2105, "Multiwavelength Transit Observations of the Candidate Disintegrating Planetesimal Orbiting WD 1145+017," ApJ, arXiv:1510.06434
    Gaensicke et al, 2015, "High-Speed Photometry of the Disintegrating Planetesimal at WD 1145+017: Evidence for Rapid Dynamical Evolution," arXiv :1512.09150
    Redfield, Seth, Jay Farihi, P. Wilson Cauley, Steven G. Parsons, Boris T. Gansicke and Girish Duvvuri, 2016, "Spectroscopic Evolution of Disintegrating Planetesimals: Minutes to Months Variability in the Circumstellar Gas Associated with WD 1145+017," ApJ, 839, 42, arXiv
    Rappaport, S., B. L. Gary, T. Kaye, A. Vanderburg, B. Croll, P. Benni & J. Foote, 2016, "Drifting Asteroid Fragments Around WD 1145+017," MNRAS, arXiv:1602.00740
    Alonso, R., S. Rappaport, H. J. Deeg and E. Palle, 2016, "Gray Transits of WD 1145+017 Over the Visible Band," Astron. & Astrophys., arXiv:1603.08823
    Petit, J.-M and M. Henon, 1986, Icarus, 66, 536-555 (link)
    Veras, Dimitri, Philip J. Carter, Zoe M. Leinhardt and Boris T. Gansicke, 2016, arXiv
    Gary, B. L., S. Rappaport, T. G. Kaye, R. Alonso and F.-J. Hamsch, "WD 1145+017 Photometric Observations During Eight Months of High Activity," 2017, MNRAS, 465, 3267-3280. PDF or arXiv
    Hallakoun, N., S. Xu, D. Maoz, T.R. Marsh, V. D. Ivanov, V. S. Dhillon, M. C. P. Bours, S. G. Parsons, P. Kerry, S. Sharma, K. Su, S. Rengaswamy, P. Pravec, P. Kusnirak, H. Kucakova, J. D. Armstrong, C. Arnold, N. Gerard, L. Vanzi, 2017, Earth and Planetary Astrophysics, arXiv 1702.05486
    Farihi, J., L. Fossati, P. J. Wheatley, B. D. Metzger, J. Mauerhan, S. Bachman, B. T. Gansicke, S. Redfield, P. W. Cauley, O. Kochukhov, N. Achilleos & N. Stone, "Magnetism, X-ras, and Accretion Rates in WD 1145+017 and other Polluted White Dwarf Systems, MNRAS, arXiv
    Tom Kaye presentation at 2016 Society for Astronomical Science meeting: link

Related Links
    Mukremin Kilic's pro/am search of dusty WDs for dips: https://www.nhn.ou.edu/%7Ekilic/Docs/dusty.html
Some observing "good practices" for amateurs (book): Exoplanet Observing for Amateurs
    Hereford Arizona Observatory (HAO): http://www.brucegary.net/HAO/
    Tutorial for faint object observing techniques using amateur hardware: http://brucegary.net/asteroids/
    Master list of my web pages & Resume

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WebMaster: Nothing on this web page is copyrighted. This site opened: 2020 November 20